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## Homework Statement

a) A back-of-the-envelope calculation shows that in about 120 seconds the gamma ray burst released a total energy of about

10^48 Joule. How does this compare to the total energy that would be released by instantly vaporizing our sun into pure energy?

(The sun's mass is about 3x10^30 kg).

b) How far away would one have to be from the gamma ray burst in order

for the average power from it (over the first 120 seconds) to be equivalent to the average power from the sun's radiation at the

earth (a quantity known as the solar constant, and which has a numerical value of about 1300 Wattëm2). Give your answer in

light years.

Ok I thought about this question and since they gave us the mass of the sun, so I was wondering if I can find E from E=mc^2. Sorry my math and physics skills are not that great. Thanx!^^