All Questions
Tagged with black-holes photons
100
questions
0
votes
1
answer
671
views
How does black hole suck light? [duplicate]
I was asked the same by my friend. I said that gravitational attraction also occurs for high energy particles .
My friend said photon is not so very high energy particle which I found on net. He ...
- 1,149
5
votes
1
answer
305
views
Black hole wrapped in mirror (at the horizon) reflecting the present (interactive, not frozen image) or the past (frozen image)?
I have read this answer from John Rennie.
https://physics.stackexchange.com/a/39388/132371
Where he says that to a Schwarzschild observer, anything reaching the event horizon will seem to be frozen ...
- 29k
3
votes
2
answers
719
views
Can a black hole absorb photons whose wavelengths are greater than the BH horizon size?
I am wondering whether a black hole can absorb photons whose wavelengths are greater than the horizon size of the black hole. I have seen different contradicting opinions on the answer. For instance ...
3
votes
1
answer
109
views
Regarding black holes and the speed of light [duplicate]
Prior to a black hole reaching sufficient (size ) to stop radiating light (due to excessive gravity ) would the speed of radiation of light slow smoothly down to zero (as the hole draws closer to the ...
- 470
2
votes
3
answers
107
views
How would a photon act to the gravitational influence of a black hole which is attracting it 180° to it's direction?
With all this situation, it’s also given that the gravitational influence is strong enough to turn the photon back. Now, the photon is being attracted directly from behind the path it is travelling on,...
- 23
-2
votes
2
answers
93
views
If black hole sucks in all masses, why does it suck in light if it is a form of energy (energy does not have mass)? [duplicate]
I have been searching for a long time for the answer.
1
vote
0
answers
54
views
Would photons trapped in a back hole have orbital angular momentum?
In a black hole radiation is trapped, it can’t escape. Its trajectories we bent by the curved spacetime.
So photon would perform at least a partial rotation about the black hole.
Would this ...
- 24.9k
12
votes
1
answer
327
views
Can gravitational waves orbit a black hole?
Assume (for the sake of simplicity) a Schwarzschild black hole (non-rotating, non charged). This black hole has a photon sphere in $r=1.5r_s$, where photons may travel in a circular orbit.
Will a ...
- 653
1
vote
1
answer
203
views
Sean Carroll's photons on top of one another
I don't have training in physics, only in mathematics.
The following is a passage from From Eternity to here by Sean Carroll, which I wanted to clarify.
Photons can be piled on top of one another ...
- 113
1
vote
0
answers
90
views
Rate of change in de Broglie wavelength in nth orbit.
Suppose I want to calculate the rate of change in de Broglie wavelength of a photon in any orbit number "n" around the black hole. Let it's original de Broglie wavelength be "λ" and the de Broglie ...
- 262
1
vote
2
answers
2k
views
An alternative derivation to find the radius of the Photon Sphere of a Black Hole
I know that the radius of the photon sphere of a Black Hole is derived by solving the Einstein field equations and it represents the smallest gravitational stable orbit around the singularity. My ...
- 262
-3
votes
3
answers
250
views
Can gravitational waves be explained by the interactions between photons? [closed]
What the question really amount to asking is, if (as LIGO said) the gravitational waves emitted from the black hole collision were emitted as 'pure energy' this surely means that they were emitted as ...
- 1,552
1
vote
0
answers
65
views
When does a black hole acquire the momentum of entering photon?
Photons carry momenta, momentum is conserved in closed systems, so what would happen when a photon enters a black hole? Supposedly the momentum of the photon will be transferred to the new combined ...
- 916
1
vote
1
answer
55
views
Is it possible for light to fall into a geo-synchronous orbit around a sufficiently massive planet?
Is it possible for (visible) light to fall into a geo-synchronous orbit around a sufficiently massive planet?
Can a planet or heavenly body be massive enough for it to happen?
What will that ...
- 171
-3
votes
2
answers
234
views
If gravity of the Earth is so strong and pulling the moon [closed]
If the gravity of the earth is so great that it is pulling the moon, then why aren't we - humans - so strongly attracted to earth that we can't even lift ourselves up?
- 43