- #1
Muhammad Valent
- 2
- 0
We know light made up of photons which is massless, but why it can absorbed by black hole? Is it becuz the Einstein's relativity about every object can curve time space
LIght doesn't have mass but it has momentum and it moves along geodesics just like everything else that is not being acted on by outside forces.Muhammad Valent said:We know light made up of photons which is massless, but why it can absorbed by black hole? Is it becuz the Einstein's relativity about every object can curve time space
phinds said:LIght doesn't have mass but it has momentum and it moves along geodesics just like everything else that is not being acted on by outside forces.
Muhammad Valent said:But Accord to momentum itu also need mass "p =mv which is non
Eric Bretschneider said:Photons have a rest mass of zero, but they can never be at rest.
Consider that photons have a defined energy and then apply energy mass equivalence. This is a bit of hand waving, but should be adequate to answer your original question.
Muhammad Valent said:Is it becuz the Einstein's relativity about every object can curve time space
RPinPA said:Newton's theory of gravitation predicted light, with no mass, will not be affected by gravity.
RPinPA said:... Newton's theory of gravitation predicted light, with no mass, will not be affected by gravity.
DrStupid said:Can you provide a corresponding calculation? In case of light deflection by a central mass I get half the effect compared to relativity.
phinds said:How could you do a calculation in Newtonian physics that says light, being massless, is affected by gravity at anything other than zero effect?
Despite having no mass, photons still have energy and momentum. When they get too close to a black hole, they can be captured by its strong gravitational pull, just like any other object with mass.
As the photons get closer to the black hole, the gravitational pull becomes stronger, and they lose more and more energy. Eventually, they reach a point of no return, known as the event horizon, where the gravitational pull is so strong that even light cannot escape.
Yes, black holes can absorb all types of light, including visible light, infrared light, ultraviolet light, and even X-rays and gamma rays. The strength of the gravitational pull depends on the mass of the black hole, so the type of light does not affect its absorption.
We can observe the effects of black holes on the light around them. For example, we can see stars and other objects behind a black hole appear distorted or even disappear as the light gets bent and absorbed by the black hole's gravity.
No, not all light that enters a black hole is absorbed. Some photons may have enough energy to escape the event horizon and be emitted back into space. This is known as Hawking radiation and is a result of the quantum effects near the event horizon.