(c) Use the fact that to show that the total radiant energy e- 15 emitted per second by unit area of a blackbody is 2xk4T4 15ch (d) If the sun's diameter is 1.4 x 10' m and its effective surface temperature is 5800 K, use the results in (c) to estimate the rate of energy loss by radiation from the sun assuming it behaves as a blackbody.