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B Are black holes white or monochromatic?

  1. Dec 19, 2016 #1
    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?
  2. jcsd
  3. Dec 19, 2016 #2


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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.
  4. Dec 19, 2016 #3


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    That is my understanding as well.
  5. Dec 19, 2016 #4


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