The temperature at which a black body of unit area loses its energy at the rate of 1 joule/second is

Options

A. `65^(@)`C
B. `-65^(@)`C
C. 65 K
D. 72 K

Answer

C

Explanation

According to Stefan's law,
`E=sigmaT^(4)`
`1 = 5.6 xx 10^(-8) xx T^(4)` or `T^(4) = 1/(5.6 xx 10^(-8))`
`rArr T=[1/(5.6 xx 10^(-6))]^(1/4)= 65`K