- #1
Stonius
- 23
- 0
I was under the impression that one of the ways of representing a black body (for explaining the ultraviolet catastrophe) is as a 'resonant box'. Frequencies lower than the dimensions of the box cannot be contained within and the black body is thus 'transparent' to those frequencies of light. (Not unlike how you don't get ocean size swell in a coffee cup - the container simply isn't big enough to allow such low frequencies).
I was thinking also how black holes have been compared to a black body for the purposes of hawking radiation. Also given the previous discussion on red/blueshift near black holes, it started me thinking about how very high frequencies of light interact with matter strongly, while very low frequencies of light interacts more weakly. In the case of light that is falling into a black hole, it is manifested by the more energetic light having a greater relativistic mass and is thus 'heavier' and is bent more by the gravity of the black hole.
Given that there is no theoretical lower limit to light frequency, I assume it is possible to have a photon who's wavelength is the size of the observable universe, though I doubt that it would interact with anything much.
So the question;
Would a black hole be able to absorb a photon who's wavelength is longer than the diameter of the event horizon? If not, how about if we could generate light of such a long wavelength from inside the black hole, say if we threw a long-wavelength-light-generator into the black hole. Could the light therefore escape from inside the black hole if the wavelength of that light was greater than the diameter of the black hole it was in?
Cheers
Markus
I was thinking also how black holes have been compared to a black body for the purposes of hawking radiation. Also given the previous discussion on red/blueshift near black holes, it started me thinking about how very high frequencies of light interact with matter strongly, while very low frequencies of light interacts more weakly. In the case of light that is falling into a black hole, it is manifested by the more energetic light having a greater relativistic mass and is thus 'heavier' and is bent more by the gravity of the black hole.
Given that there is no theoretical lower limit to light frequency, I assume it is possible to have a photon who's wavelength is the size of the observable universe, though I doubt that it would interact with anything much.
So the question;
Would a black hole be able to absorb a photon who's wavelength is longer than the diameter of the event horizon? If not, how about if we could generate light of such a long wavelength from inside the black hole, say if we threw a long-wavelength-light-generator into the black hole. Could the light therefore escape from inside the black hole if the wavelength of that light was greater than the diameter of the black hole it was in?
Cheers
Markus