Question

A metal piece is heated up to T abs. The temperature of the surrounding is t abs.The heat in the surrounding due to radiation is proportional to

(a) (T – T)4

(b) T4 – t4

(c) (T – t)1/4

(d) T2 – t2

Answer 1

Correct option: (b) T4 – t4

Explanation:

According to Stefan’ law heat emitted per second per unit area α ( T14 - T24)where T1 is the temperature of body & T2 is the temperature of surrounding (T1 & T2 are on Kelvin scale).