Are black holes white or monochromatic?

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I was asked if black holes are white today. I answered no, they're perfectly black to fit with classical physics since it's a high school kid who asked.

It did get me thinking about Hawking radiation though and I haven't been able to find an answer to my question online. Is Hawking radiation broadband or does it only emit photons at very specific energy levels?
 

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  • #2
Drakkith
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I believe Hawking radiation approximates a blackbody, so a black hole would emit a broad range of wavelengths which would change as it gains or loses mass.
 
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  • #3
phinds
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I believe Hawking radiation approximates a blackbody, so a black hole would emit a broad range of wavelengths which would change as it gains or loses mass.
That is my understanding as well.
 
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mathman
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