Assume the surface area of the event horizon of an ordinary black hole is 10(adsbygoogle = window.adsbygoogle || []).push({}); ^{50},

ordinary meaning uncharged and nonrotating.

The hole glows with Hawking radiation----what is the radiant power?

I gave the event horizon area in natural units but it's easy to convert to square meters if you wish it that way.

The area 10^{50}is 2.6 x 10^{-20}square meters, or 2.6 square angstroms.

In natural units (c=G=hbar=k=1) the radiant power of a BH

with area A is simply

1/960A

So having the area 10^{50}means that the luminosity is essentially 10^{-53}. To which of the four wattage figures given in the poll is this equivalent?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# The Hawking wattage of a black hole

**Physics Forums | Science Articles, Homework Help, Discussion**