1. The problem statement, all variables and given/known data At what rate does a 0.1m cube of metal with emissivity e=0.75 radiate energy if it is at a temperature of 200C? 2. Relevant equations H=AeσT^4, σ=5.67 x10^-8 3. The attempt at a solution I found the area of the cute to be A=(0.1m)^2=0.01m, and the turned 200C into 473K, but when I type them all in I get 21.28W and the answer is 128W?