d*****r
发帖数: 4 | 1 Yes, light has both wave-like and particle-like properties. But you don't
need to calculate the rest mass of a photon, because it's always 0.:)
I never learned that the speed of photon becomes slower in a gravitational
field. Can you tell me which book you read?
About why light cannot escape from a black hole, it's a GR effect. It's
related to the curvature of spacetime in a gravitational field. Actually,
I am not understand it well. You can read some textbooks of GR. Also, there
is useful expla |
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