User Hritik Narayan

51 votes

5 answers

7k views

Are there any theoretical limits on the energy of a photon?

asked Jan 17, 2015 at 14:41

31 votes

2 answers

4k views

Is there a limit as to how fast a black hole can grow?

general-relativity classical-mechanics black-holes astrophysics

asked Feb 26, 2015 at 16:33

27 votes

7 answers

3k views

Why don't photons split up into multiple lower energy versions of themselves?

electromagnetism photons entropy quantum-electrodynamics

asked Aug 28, 2015 at 13:53

8 votes

1 answer

580 views

Are the distances we measure to objects in the universe incorrect because of their relative motion?

cosmology astronomy speed-of-light space-expansion galaxies

asked Nov 15, 2014 at 13:33

7 votes

5 answers

2k views

Is the shell theorem only an approximation?

newtonian-mechanics forces newtonian-gravity

asked Jan 11, 2015 at 13:38

7 votes

2 answers

950 views

Can a hydrogen cloud directly collapse to form a black hole?

general-relativity black-holes astrophysics stellar-physics stellar-evolution

asked Jun 30, 2017 at 11:20

6 votes

1 answer

263 views

Why is Hawking radiation exclusive to black holes only?

quantum-field-theory general-relativity astrophysics hawking-radiation

asked Jun 14, 2017 at 10:22

6 votes

2 answers

314 views

How can we differentiate between matter and antimatter? [duplicate]

quantum-mechanics cosmology symmetry antimatter galaxies

asked Nov 15, 2014 at 14:30

5 votes

2 answers

5k views

How does the Hawking Radiation mechanism cause a black hole to lose its mass? [duplicate]

black-holes hawking-radiation qft-in-curved-spacetime black-hole-thermodynamics

asked Dec 23, 2014 at 12:58

5 votes

1 answer

276 views

Does quantum spin contribute to the angular momentum of a black hole?

general-relativity black-holes angular-momentum conservation-laws quantum-spin

asked Jun 25, 2017 at 15:05

4 votes

1 answer

42k views

Why does air feel cooler when blown through a small hole and warm through a big one? (for example from a mouth) [duplicate]

thermodynamics everyday-life temperature air

asked Dec 9, 2014 at 12:16

3 votes

1 answer

571 views

How does a sonic black hole (or dumb hole) work?

fluid-dynamics black-holes acoustics hawking-radiation phonons

asked Dec 30, 2014 at 12:57

3 votes

1 answer

851 views

Change in radius of a charged bubble

fluid-dynamics electrostatics surface-tension bubbles

asked Apr 13, 2015 at 11:05

3 votes

2 answers

231 views

Are there hypothetical processes which allow the existence of a fission powered star?

nuclear-physics astrophysics stars

asked Aug 11, 2015 at 9:13

2 votes

2 answers

551 views

What kind of volume does the event horizon of a Kerr black hole enclose?

general-relativity black-holes kerr-metric

asked May 30, 2015 at 11:54

2 votes

1 answer

116 views

If I kept getting closer and closer to the speed of light, what would be the gravitational effects appearing like to an observer? [duplicate]

special-relativity black-holes speed-of-light length-contraction

asked Dec 21, 2014 at 14:28

1 vote

1 answer

515 views

Can the angular momentum of any rigid body (symmetrical or asymmetrical) be found this way?

classical-mechanics angular-momentum rotation rigid-body-dynamics moment-of-inertia

asked Nov 4, 2014 at 13:47

1 vote

1 answer

431 views

Why do some objects tend to change their axis of rotation while rotating?

classical-mechanics everyday-life rotational-dynamics rotational-kinematics

asked Nov 30, 2014 at 13:30

0 votes

1 answer

138 views

What happens to K.E. in matter antimatter annihilation?

quantum-mechanics energy-conservation antimatter

asked Nov 18, 2014 at 12:27

0 votes

1 answer

189 views

Is the event horizon also the boundary region of the mass contained by a black hole?

general-relativity gravity black-holes event-horizon singularities

asked Nov 22, 2014 at 5:53

0 votes

2 answers

221 views

Can a body ever experience acceleration this strong?

newtonian-mechanics general-relativity gravity black-holes speed-of-light

asked Nov 23, 2014 at 15:38

0 votes

2 answers

3k views

Why do objects seem to move faster (relatively) when they move tangential to the observer?

kinematics everyday-life observers relative-motion

asked Jan 20, 2015 at 15:20

0 votes

1 answer

561 views

How to find the force due to fluid pressure over a surface?

homework-and-exercises fluid-dynamics pressure fluid-statics

asked Apr 5, 2015 at 14:04

0 votes

1 answer

736 views

About a recent experiment which claims reality doesn't exist until we measure it?

quantum-mechanics experimental-physics

asked Jun 1, 2015 at 17:30

0 votes

1 answer

54 views

Can I destroy a star faster by trapping it in a spherical mirror? [duplicate]

thermodynamics astrophysics reflection stars stellar-physics

asked Dec 23, 2019 at 7:57

-2 votes

1 answer

85 views

Two different expressions for the Schwarzschild Radius? [closed]

general-relativity gravity black-holes

asked Jan 18, 2015 at 12:06

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26 Questions

Are there any theoretical limits on the energy of a photon?

Is there a limit as to how fast a black hole can grow?

Why don't photons split up into multiple lower energy versions of themselves?

Are the distances we measure to objects in the universe incorrect because of their relative motion?

Is the shell theorem only an approximation?

Can a hydrogen cloud directly collapse to form a black hole?

Why is Hawking radiation exclusive to black holes only?

How can we differentiate between matter and antimatter? [duplicate]

How does the Hawking Radiation mechanism cause a black hole to lose its mass? [duplicate]

Does quantum spin contribute to the angular momentum of a black hole?

Why does air feel cooler when blown through a small hole and warm through a big one? (for example from a mouth) [duplicate]

How does a sonic black hole (or dumb hole) work?

Change in radius of a charged bubble

Are there hypothetical processes which allow the existence of a fission powered star?

What kind of volume does the event horizon of a Kerr black hole enclose?

If I kept getting closer and closer to the speed of light, what would be the gravitational effects appearing like to an observer? [duplicate]

Can the angular momentum of any rigid body (symmetrical or asymmetrical) be found this way?

Why do some objects tend to change their axis of rotation while rotating?

What happens to K.E. in matter antimatter annihilation?

Is the event horizon also the boundary region of the mass contained by a black hole?

Can a body ever experience acceleration this strong?

Why do objects seem to move faster (relatively) when they move tangential to the observer?

How to find the force due to fluid pressure over a surface?

About a recent experiment which claims reality doesn't exist until we measure it?

Can I destroy a star faster by trapping it in a spherical mirror? [duplicate]

Two different expressions for the Schwarzschild Radius? [closed]