Question

Whis is black holes entropy

Answer #1

Beckenstein said that: * the total generalized entropy
never decreases.* Beckenstein gave the generalized
second law, that always holds: in any process, the total
generalized entropy
never decreases. The Beckenstein-Hawking entropy or black hole
entropy is the amount of entropy that must be assigned to a black
hole in order for it to follow the laws of thermodynamics as they
are understood by the observers external to the black hole.

The Beckenstein bound says that the **maximum possible
entropy of a black hole is S = A/4**, where A is the
two-dimensional area of the black hole's event horizon in units of
the Planck's area.

how is it possible for astronomers to find black holes?

What evidence do we have that black holes exist? (You may use
any resource)

Many galaxies have supermassive black holes at their
centers. As material swirls around such a black hole, it is heated,
becomes ionized, and generates strong magnetic fields. The
resulting magnetic forces steer some of the material into
high-speed jets that blast out of the galaxy and into intergalactic
space. The light we observe from the jet in Fig. has a frequency of
6.66x10^14 Hz (in the far ultraviolet region of the electromagnetic
spectrum), but in the reference frame of the...

1. Explain how black holes are observed.
2. Use the astronomical distance ladder.
3. Compare and contrast disk and elliptical galaxies.
4. Describe the content and history of the Milky Way.
5. Explain the evidence for dark matter.
6. Relate the Hubble plot and the age of the universe.
7. Describe the evolution of the Universe's size, temperature,
density, and composition.
Describe evidence for the Big Bang model, beyond the expansion
of the Universe.

Your twin sister is hovering very near but outside the event
horizon of a black hole. From a safe distance away, we see that her
clock a) slowing down compared to our clock. b) speeding up
compared to our clock. c) completely stopped. d) behaving normally,
just like our clock. e) behaving normally, but bluer in color than
our clock.
8. Your twin sister crosses the event horizon to be “inside” a
black hole. Shining her flashlight back toward us,...

Entropy of Universe and Entropy of Generation is the
samee????

Write the distribution function for the holes in the valence
band.

Explain why the entropy of a gas is much greater than the
entropy of a liquid, and why the entropy of a liquid is greater
than the entropy of a solid

Which statements about entropy are true?
1. Entropy is a measure of disorder in a system.
2. Entropy is a state function.
3. An increase in entropy is associated with an increase in the
order of a system.
4.The minimal value of entropy is zero.

(a) How is the uncertainty function related to the thermodynamic
entropy?
(b) To the statistical entropy?
(c) What is the relationship of the thermodynamic entropy to the
"arrow of time" (direction of time)?
Explain each part briefly.

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