- #1

quasar_4

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## Homework Statement

By setting the total energy of photons to Mc^2, estimate the maximum number of photons that could be used to make a black hole of mass M.

This is a thermal physics problem, in case anyone needs a context; we're discussing the entropy of a black hole.

## Homework Equations

I'm given the entropy for a black hole. I also know the Schwarzschild radius.

## The Attempt at a Solution

I'm just having trouble seeing where to start. Probably this is something very basic and I'm just missing it. Can someone just help me to start?