Answer : 27
Monday, August 21, 2017
Saturday, August 6, 2016
Physics MCQ's ( Basic + Advance - Must have) Pocket book pdf
Collection of Physics MCQ's ( Basic + Advance - Must have) Pocket book pdf download now
Sunday, February 7, 2016
Why does ice float on water ?
"Ice is less dense than water because of its intermolecular forces."
Water contains hydrogen bonds (a type of
intermolecular force of attraction) between the H (hydrogen) of one atom
and the O (oxygen) of another atom. As the water gets colder and the
kinetic energy of the molecules decreases, the hydrogen bonds keep the
water molecules apart, forming hexagonal structures with water molecules
at each vertex. In between the water molecules is nothing. In liquid
water, the molecules of water can be much closer together; the hydrogen
bonds are more flexible. Therefore, the solid ice, with its molecules
kept at a fairly fixed distance and the crystals holding lots of
"nothing" among the water molecules, is less dense than the liquid
water.
Thursday, December 10, 2015
Monday, November 23, 2015
Can anything travel faster than light ??
What Travels Faster Than the Speed of Light ??
Many people wants to know that ,can anything travel faster than speed of light..?? or simply What Travels Faster Than the Speed of Light ??If you have the same question than here is the answer :
Most textbooks say that nothing can go faster than light, but that
statement actually should be qualified: The answer is yes, you can break
the light barrier, but not in the way we see in the movies. There are,
in fact, several ways to travel faster than light:
1. The Big Bang itself expanded much faster than the
speed of light. But this only means that "nothing can go faster than
light." Since nothing is just empty space or vacuum, it can expand
faster than light speed since no material object is breaking the light
barrier. Therefore, empty space can certainly expand faster than light.
2. If you wave a flashlight across the night sky,
then, in principle, its image can travel faster than light speed (since
the beam of light is going from one part of the Universe to another part
on the opposite side, which is, in principle, many light years away).
The problem here is that no material object is actually moving faster
than light. (Imagine that you are surrounded by a giant sphere one light
year across. The image from the light beam will eventually hit the
sphere one year later. This image that hits the sphere then races across
the entire sphere within a matter of seconds, although the sphere is
one light year across.) Just the image of the beam as it races across
the night sky is moving faster than light, but there is no message, no
net information, no material object that actually moves along this
image.
3. Quantum entanglement moves faster than light. If I
have two electrons close together, they can vibrate in unison,
according to the quantum theory. If I then separate them, an invisible
umbilical cord emerges which connects the two electrons, even though
they may be separated by many light years. If I jiggle one electron, the
other electron "senses" this vibration instantly, faster than the speed
of light. Einstein thought that this therefore disproved the quantum
theory, since nothing can go faster than light.
But actually this experiment (the EPR experiment) has been done many
times, and each time Einstein was wrong. Information does go faster than
light, but Einstein has the last laugh. This is because the information
that breaks the light barrier is random, and hence useless. (For
example, let's say a friend always wears one red sock and one green
sock. You don't know which leg wears which sock. If you suddenly see
that one foot has a red sock, then you know instantly, faster than the
speed of light, that the other sock is green. But this information is
useless. You cannot send Morse code or usable information via red and
green socks.)
4. The most credible way of sending signals faster than light is via negative matter. You can do this either by:
a) compressing the space in front of your and
expanding the space behind you, so that you surf on a tidal wave of
warped space. You can calculate that this tidal wave travels faster than
light if driven by negative matter (an exotic form of matter which has
never been seen.) b) using a wormhole, which is a portal or shortcut
through space-time, like the Looking Glass of Alice.
In summary, the only viable way of breaking the light barrier may be
through General Relativity and the warping of space time. However, it is
not known if negative matter exists, and whether the wormhole will be
stable. To solve the question of stability, you need a fully quantum
theory of gravity, and the only such theory which can unite gravity with
the quantum theory is string theory (which is what I do for a living).
Sadly, the theory is so complex that no has been able to fully solve it
and give a definitive anwer to all these questions. Maybe someone
reading this blog will be inspired to sovle string theory and answer the
question whether we can truly break the light barrier.
Friday, October 2, 2015
What is the speed of electricity?
What is the speed of electricity ?
The speed of electricity really depends on what you mean by the word
"electricity". This word is very general and basically means, "all
things relating to electric charge". I will assume we are referring to a
current of electrical charge traveling through a metal wire, such as
through the power cord of a lamp. In the case of electrical currents
traveling through metal wires, there are three different velocities
present, all of them physically meaningful:
- The individual electron velocity
- The electron drift velocity
- The signal velocity
In order to understand each of these speeds and why they are all
different and yet physically meaningful, we need to understand the
basics of electric currents. Electric currents in metal wires are formed
by free electrons that are moving. In the context of typical electric
currents in metal wires, free electrons can be thought of as little
balls bouncing around in the grid of fixed, heavy atoms that make up the
metal wire. Electrons are really quantum entities, but the more
accurate quantum picture is not necessary in this explanation. (When you
add in quantum effects, the individual electron velocity becomes the
"Fermi velocity".) The non-free electrons, or valence electrons, are
bound too tightly to atoms to contribute to the electric current and so
can be ignored in this picture. Each free electron in the metal wire is
constantly flying in a straight line under its own momentum, colliding
with an atom, changing direction because of the collision, and
continuing on in a straight line again until the next collision. If a
metal wire is left to itself, the free electrons inside constantly fly
about and collide into atoms in a random fashion. Macroscopically, we
call the random motion of small particles "heat". The actual speed of an
individual electron is the amount of nanometers per second that an
electron travels while going in a straight line between collisions. A
wire left to itself carries no electric signal, so the individual
electron velocity of the randomly moving electrons is just a description
of the heat in the wire and not the electric current.
Now, if you connect the wire to a battery, you have applied an
external electric field to the wire. The electric field points in one
direction down the length of the wire. The free electrons in the wire
feel a force from this electric field and speed up in the direction of
the field (in the opposite direction, actually, because electrons are
negatively charged). The electrons continue to collide with atoms, which
still causes them to bounce all around in different directions. But on
top of this random thermal motion, they now have a net ordered movement
in the direction opposite of the electric field. The electric current in
the wire consists of the ordered portion of the electrons' motion,
whereas the random portion of the motion still just constitutes the heat
in the wire. An applied electric field (such as from connecting a
battery) therefore causes an electric current to flow down the wire. The
average speed at which the electrons move down a wire is what we call
the "drift velocity".
Even though the electrons are, on average, drifting down the wire at the drift velocity, this does not mean that the effects
of the electrons' motion travels at this velocity. Electrons are not
really solid balls. They do not interact with each other by literally
knocking into each other's surfaces. Rather, electrons interact through
the electromagnetic field. The closer two electrons get to each other,
the stronger they repel each other through their electromagnetic fields.
The interesting thing is that when an electron moves, its field moves
with it, so that the electron can push another electron farther down the
wire through its field long before physically reaching the same
location in space as this electron. As a result, the electromagnetic
effects can travel down a metal wire much faster than any individual
electron can. These "effects" are fluctuations in the electromagnetic
field as it couples to the electrons and propagates down the wire. Since
energy and information are carried by fluctuations in the
electromagnetic field, energy and information also travel much faster
down an electrical wire than any individual electron.
The speed at which electromagnetic effects travel down a wire is
called the "signal velocity", "the wave velocity", or "the group
velocity". Note that some books insinuate that the signal velocity
describes a purely electromagnetic wave effect. This insinuation can be
misleading. If the signal traveling down an electric cable was an
isolated electromagnetic wave, then the signal would travel at the speed
of light in vacuum c. But it does not. Rather, the signal
traveling down an electric cable involves an interaction of both the
electromagnetic field fluctuations (the wave) and the electrons. For
this reason, the signal velocity is much faster than the electron drift
velocity but is slower than the speed of light in vacuum. Generally, the
signal velocity is somewhat close to the speed of light in vacuum. Note
that the "signal velocity" discussed here describes the physical speed
of electromagnetic effects traveling down a wire. In contrast, engineers
often use the phrase "signal speed" in a non-scientific way when they
really mean "bit rate". While the bit rate of a digital signal traveling
through a network does depend on the physical signal velocity in the
wires, it also depends on how well the computers in the network can
route the signals through the network.
Consider this analogy. A long line of people is waiting to enter a
restaurant. Each person fidgets nervously about in their spot in line.
The person at the end of the line grows impatient and shoves the person
in front of him. In turn, when each person in the line receives a shove
from the person behind him, he shoves the person in front of him. The
shove will therefore be passed along from person to person, forwards
through the line. The shove will reach the restaurant doors long before
the last person in line personally makes it to the doors. In this
analogy, the people represent the electrons, their arms represent the
electromagnetic field, and the shove represents a fluctuation or wave in
the electromagnetic field. The speed at which each person fidgets
represents the individual electron velocity, the speed at which each person individually progresses through the line represents the electron drift velocity, and the speed at which the shove travels through the line represents the signal velocity.
Based on this simple analogy, we would expect the signal velocity to be
very fast, the individual velocity to be somewhat fast, and the drift
velocity to be slow. (Note that in physics there is also another
relevant speed in this context called the "phase velocity". The phase
velocity is more of a mathematical tool than a physical reality, so I do
not think it is worth discussing here).
The individual electron velocity in a metal wire is typically
millions of kilometers per hour. In contrast, the drift velocity is
typically only a few meters per hour while the signal velocity is a
hundred million to a trillion kilometers per hour. In general, the
signal velocity is somewhat close to the speed of light in vacuum, the
individual electron speed is about 100 times slower than the signal
velocity, and the electron drift speed is as slow as a snail.
What is electricity and How Electricity is Produced ?
What is electricity ?
Electricity is a form of energy that starts with atoms. You can't see
atoms because they're too small, but they make up everything around us.
There are three parts to an atom: protons, neutrons and electrons.
Electricity is created when electrons move from atom to atom. There are a
number of ways to make electrons move, but most electricity is produced
at power plants.
How do power plants work ?
Power plants that use water to make electricity are built near rivers.Dams are built across rivers to hold back the water. The water is then
directed through big pipes and it falls against the blades of giant
turbines. The turbines have blades on them that turn when the water hits
them, just like the blades of a pinwheel turn when you blow on them.
Once the water hits the blades, it returns to the river.
The turbine blades are attached to a big metal rod, and at the end of
that rod are large magnets. When the blades turn, they make the rod and
the magnets spin very fast. The magnet end is surrounded by heavy coils
of copper wire, and the spinning magnets cause electrons in the wire to
begin to move, creating electricity.
What happens to the electricity after that ?
It moves through wires into what's called a power transformer. The
electrical voltage (the strength at which electricity flows) is fairly
high and the transformer makes it even higher to help it flow through
wires called transmission lines. Those wires are attached to wooden or
metal poles that you see along roads and throughout communities.
All the wires are made of metal – usually aluminum or copper. That's
because metal is a good conductor – electricity travels through it
easily. By the way, water is also a good conductor, and because our
bodies are mostly made of water, electricity can travel through us
easily. That's not something we want to happen though, because if we
have electricity going through us we'll likely be seriously hurt or even
killed. That's why grown-ups warn you to stay away from high voltage
sites and not to stick your fingers in a wall plug.
Electricity travels fast – about 310,000 kilometers per second! If you
moved that fast, you could probably make several trips around the world
in the time it takes to turn on a light!
Sometimes, when electricity has to travel a long way it gets a little
weaker as it moves along the lines. It needs a boost (like you need food
to replace the energy you've burned after playing outside all day).
That's where substations help. Substations are large box-like power
transformers that sit in fenced-in areas. You'll see signs on the fences
that say high voltage – stay away and it's really important that you
obey those signs (remember what you read about electricity being able to
travel easily through your body).
How does electricity get into my house ?
When wires reach your house, another transformer on the power pole
makes the electricity just the right voltage so you can use it safely.
The wire is connected to a meter box that keeps track of how much
electricity is being used. There are wires in your house connected to
plugs, also called outlets. These outlets let you plug in your boom box,
television set, or any thing else electrical. What an amazing journey
electricity takes to get to your home !!
Monday, September 28, 2015
Nasa has announced that it has found evidence of flowing water on Mars
Nasa Mars water announcement: agency announces it has found proof of flowing water, improving chances of supporting alien life
Nasa has announced that it has found evidence of flowing water on
Mars — a discovery with potentially huge implications for the
possibility of life on the planet.
Scientists have long suspected that the planet might have running
water. But the new findings confirm that it is on the planet, combined
with “hydrated salts” in a brine.
Normally, water on Mars freezes or evaporates, because of the intense
environment on the planet. But the addition of salts means that it is
much more stable, allowing it to survive on the Red Planet.
Scientists have long speculated that the Recurring Slope Lineae — or
dark patches — on Mars were made up of briny water. But the new findings
prove that those patches are caused by liquid water, which it has
established by finding the hydrated salts.
The new research is based on an analysis of spectral data from the
American space agency Nasa's Mars Reconnaissance Orbiter spacecraft.
Breaking down reflected light into its different wavelengths provides
a chemical "fingerprint" of what a substance is made of. The Mars
scientists devised a new method that allowed chemical signatures to be
extracted from individual image pixels, providing a much higher level of
resolution than had been achieved before.
“Recurring Slope Lineae (RSL) are seasonal flows on warm Martian
slopes initially proposed, but not confirmed, to be caused by briny
water seeps,” the team behind the discovery wrote in another paper, due
to be delivered this week. “Here we report spectral evidence for
hydrated salts on RSL slopes from four different RSL locations from the
Compact Reconnaissance Imaging Spectrometer for Mars on board Mars
Reconnaissance Orbiter.
“These results confirm the hypothesis that RSL are due to present-day activity of briny water. “
Source:http://www.independent.co.uk/news/science/nasa-mars-water-announcement-agency-announces-that-it-has-found-proof-of-flowing-water-on-mars-a6670446.html
Friday, September 18, 2015
Tuesday, September 15, 2015
New Horizons: New 'treasure trove' of high resolution images show Pluto's surface in greater detail
New Horizons: New 'treasure trove' of high resolution images show Pluto's surface in greater detail
New high-resolution images downloaded from NASA's New
Horizons probe over 5 billion kilometres away have stunned scientists,
revealing Pluto's pitted and cratered surface in even more detail than
before.
The New Horizons probe passed Pluto in July,
sending back the first close-up images ever seen of the dwarf planet
and taking tens of gigabits of data that will take an entire year to
send back to Earth.
The latest images now show a range of highly
complex surface features, including mountains, deep networks of valleys,
nitrogen ice flows and possible wind-blown dunes.
"This is what we came for — these images, spectra and
other data types that are going to help us understand the origin and
the evolution of the Pluto system for the first time," said New Horizons
principal investigator Alan Stern, of the Southwest Research Institute
(SwRI) in Colorado.
"And what's coming is not just the remaining
95 per cent of the data that's still aboard the spacecraft — it's the
best datasets, the highest-resolution images and spectra, the most
important atmospheric datasets, and more. It's a treasure trove.
"Pluto is showing us a diversity of landforms and complexity of processes that rival anything we've seen in the solar system.
"If
an artist had painted this Pluto before our flyby, I probably would
have called it over the top — but that's what is actually there."
The
revelation of possible dunes on the dwarf planet's surface has also
piqued scientists' interest, as they indicate the atmosphere would have
had to be thicker for wind to create the formations.
Timelapse: Pluto comes into focus
View an interactive timelapse of Pluto images captured by New Horizons, and find out what they tell us about this icy dwarf planet.
"Seeing dunes on Pluto — if that is what they are — would be
completely wild, because Pluto's atmosphere today is so thin," said
William B McKinnon, a GGI deputy lead from Washington University.
"Either Pluto had a thicker atmosphere in the past, or some process we haven't figured out is at work. It's a head-scratcher."
The images have more than doubled the amount of Pluto's surface, seen at resolutions as good as 400 metres per pixel.
They
have also revealed Pluto's global atmospheric haze has more layers than
scientists realized, creating a twilight effect that softly illuminates
nightside terrain near sunset, making it visible to the cameras aboard
New Horizons.
"This bonus twilight view is a wonderful gift that Pluto has handed to us," said John Spencer, a GGI deputy lead from SwRI.
"Now we can study geology in terrain that we never expected to see."
The
discoveries made from the new imagery will not be limited to the dwarf
planet itself — better images of Pluto's moons Charon, Nix and Hydra are
also set to be released.
Earth just had its first storm-free hurricane peak in 38 years
Earth just had its first storm-free hurricane peak in 38 years
September 12 marks the peak of the Atlantic Ocean hurricane season,
but this year the day passed without any named storms. Odder still, the
recently restless Pacific Ocean had a quiet day, too. In fact, across
the entire Northern Hemisphere, not a single tropical storm swirled.
This is the first September 12 without a major cyclone since 1977, says Philip Klotzbach,
a meteorologist at Colorado State University in Fort Collins. Tropical
Storm Vamco’s formation on Sunday ended the 54-hour serenity, the
longest September dearth of tropical cyclones since 2009, Klotzbach adds.
While the ongoing El Niño will help calm the Atlantic (SN Online: 7/12/15), those same conditions will probably keep the Pacific churning out titanic typhoons for the next few months
Satellite captures double solar eclipse in action
Satellite captures double solar eclipse in action
Launched in 2010, SDO studies the sun’s churning atmosphere. Its tilted geosynchronous orbit gives the spacecraft a nearly uninterrupted view, but on rare occasions like this, the Earth or moon can get in the way.
how many calories in a banana ..?
The banana is an edible fruit, botanically a berry, produced by several kinds of large herbaceous flowering plants in the genus Musa.
Nutrition Facts
Bananas
Amount Per 100 grams
|
| Calories 89 |
| % Daily Value* | |
| Total Fat 0.3 g | 0% |
| Saturated fat 0.1 g | 0% |
| Polyunsaturated fat 0.1 g | |
| Monounsaturated fat 0 g | |
| Cholesterol 0 mg | 0% |
| Sodium 1 mg | 0% |
| Potassium 358 mg | 10% |
| Total Carbohydrate 23 g | 7% |
| Dietary fiber 2.6 g | 10% |
| Sugar 12 g | |
| Protein 1.1 g | 2% |
| Vitamin A | 1% | Vitamin C | 14% |
| Calcium | 0% | Iron | 1% |
| Vitamin D | 0% | Vitamin B-6 | 20% |
| Vitamin B-12 | 0% | Magnesium | 6% |
Monday, September 7, 2015
We know the Earth is rotating, but why?
Why is everything in the Solar System spinning? And why is it mostly all spinning in the same direction?
Why is everything in the Solar System spinning? And why is it mostly all spinning in the same direction?
It can’t be a coincidence. Look down on the Earth from above, and you’d see that it’s turning in a counter-clockwise direction. Same with the Sun, Mars and most of the planets.
4.54 billion years ago, our Solar System formed within a cloud of hydrogen not unlike the Orion Nebula, or the Eagle Nebula, with its awesome pillars of creation. Then, it took some kick, like from the shock wave from a nearby supernova, and this set a region of the cold gas falling inward through its mutual gravity. As it collapsed, the cloud began to spin.
But why?
It’s the conservation of angular momentum.
Think about the individual atoms in the cloud of hydrogen. Each
particle has its own momentum as it drifts through the void. As these
atoms glom onto one another with gravity, they need to average out their
momentum. It might be possible to average out perfectly to zero, but
it’s really really unlikely.
Which means, there will be some left over. Like a figure skater
pulling in her arms to spin more rapidly, the collapsing proto-Solar
System with its averaged out particle momentum began to spin faster and
faster.
This is the conservation of angular momentum at work.
As the Solar System spun more rapidly, it flattened out into a disk
with a bulge in the middle. We see this same structure throughout the
Universe: the shape of galaxies, around rapidly spinning black holes,
and we even see it in pizza restaurants.
The Sun formed from the bulge at the center of this disk, and the
planets formed further out. They inherited their rotation from the
overall movement of the Solar System itself.
Over the course of a few hundred million years, all of the material
in the Solar System gathered together into planets, asteroids, moons and
comets. Then the powerful radiation and solar winds from the young Sun
cleared out everything that was left over.
Without any unbalanced forces acting on them, the inertia of the Sun
and the planets have kept them spinning for billions of years.
And they’ll continue to do so until they collide with some object, billions or even trillions of years in the future.
So are you still wondering, why does the Earth spin?
The Earth spins because it formed in the accretion disk of a cloud of
hydrogen that collapsed down from mutual gravity and needed to conserve
its angular momentum. It continues to spin because of inertia.
The reason it’s all the same direction is because they all formed together in the same Solar Nebula, billions of years ago.
Sunday, September 6, 2015
What's the difference between fission & fusion ?
What's the difference between fission & fusion ?
A nuclear reaction is a process in which atoms collide with other atoms
and lose some of their original mass. Because of the principle of
energy conservation the lost mass must reappear as generated energy,
according to Einstein's equation E = mc². The two types of nuclear
reactions used to produce energy are fission and fusion.
In a fission reaction, a heavy atomic nucleus is split into
smaller nuclei, other particles and radiation. In a typical reaction, an
atom of uranium 235 absorbs a neutron and splits into two lighter
atoms, barium and krypton, emitting radiation and neutrons. Under
special circumstances (the attainment of a "critical mass") the emitted
neutrons can split further atoms, which in turn bring about more
splitting, producing a very fast chain reaction. Nuclear power plants
exploit the process of fission to create energy.
In a fusion reaction, two or more light atomic nuclei fuse to form a single heavier nucleus. The mass change in the process is the source of nuclear energy. Fusion within the cores of the sun and other stars generates their radiating energy by fusing two hydrogen atoms to produce a helium atom. Current researchers are using magnetic vacuum chambers and laser beams in an attempt to generate the extreme high-temperatures necessary for the fusion process. If successful, the net energy gain would create a viable alternative energy option.
Friday, September 4, 2015
Thursday, September 3, 2015
Wednesday, September 2, 2015
Friday, August 28, 2015
How Can We See Black Holes ?
How Can We See Black Holes?
Can we see a Black holes..? if you have this question in your mind than here is answer for you.
Though we cannot "see" a black hole itself (since not even light can
escape the hole's gravitational field), we may see the hole's effects on
nearby matter. For example, if gas from a nearby star were sucked
towards the black hole, the intense gravitation
al energy would heat the gas to millions of degrees. The resulting X-ray
emissions could point to the presence of the black hole.
Or, if a massive black hole were surrounded by large amounts of orbiting
material -- gas, dust, even stars -- their rapid motion close to the
hole could be observable via shifts in the energy of the radiation they
emit. Evidence along these lines is mount
ing, suggesting that black holes may not be that rare in the universe.
However, such evidence remains indirect and therefore inconclusive. To
confirm that black holes actually exist, we'll need to be able to
observe the gravitational waves they produce as they form or interact.
If scientists could build gravitational wave detectors
of sufficient sensitivity, they should be able to measure the
vibrations in spacetime generated by black holes as they form from a
collapsing star, when they ingest large amoun
ts of matter, or if they interact, even collide with a second black hole
or another massive object, such as a neutron star. Certain patterns of
gravitational waves emitted would reveal the "smoking gun."
So far, the wavelike disturbances in spacetime have eluded detection.
In a relativistic universe, there should be no shortage of places in
which to hunt for black holes. Much larger and more sensitive detectors
are now under construction. With luck, soon
gravitation scientists may be shouting "Eureka!"
Tuesday, August 25, 2015
10 Mind-Blowing Facts About Black Holes
10 Mind-Blowing Facts About Black Holes
Here are 10 interesting facts about black holes
1. It was John Mitchell who actually first proposed the idea of ‘dark
stars’ or object. Later, in 20th century the term ‘black hole’ was
coined.
2. Black holes are actually leftovers of former stars and are so
dense that nothing can flee from their dominant gravitational energy.
3. If the formation of a black hole has taken place, it can continue to grow by absorbing additional matter.
4. Generally the life cycle of most of the stars end up being a white
dwarf or a neutron star, but, black holes are considered to be the last
evolutionary stage in the lifetime of a star.
5. There are mainly three types of black holes namely stellar, super massive and miniature black holes, depending on their mass.
6. Since black holes possess strong gravitational force which pulls all of the light into its center, they cannot be seen.
7. Black holes follow the laws of gravity and hence in order to
affect the earth, the orbit of a black hole would have to be very close
to the solar system, which is not likely.
8. Astronomers are confident that our own Milky Way galaxy has a super massive black hole at its center.
9.Black holes have to hold a massive amount of mass in an incredibly small
space to have the required gravity to pull light in. For example, to
make a black hole with the mass of Earth, the entire planet would need
to be squeezed down to a space 9 millimeters across.
10.When anything (be it planets, suns, galaxies or particles of light)
passes close to a black hole, they will be pulled in by its gravity. If
something else acting on the object, like say a rocket, is stronger than
the black hole's gravity, it can escape the pull.
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