Question

Body radiates 5 w energy at atemperature of 400 k . If the temperature is increased to 1200 k . Then it radiates energy at the rate of

Answer 1

405..................

Answer 2

Answer:

Radiates energy at the rate of $405 W$

Explanation:

The rate of energy radiation from a body at temperature T,

$P=\sigma A T^4$

Hence$\dfrac{P_2}{P_1}=\dfrac{T_2^4}{T_1^4}$

$\implies P_2=3^4\times 5W=405W$