If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of

A. 3

B. 9

C. 270

D. 81

Answer: Option D

Solution(By Examveda Team)

$$\frac{{{{\text{E}}_2}}}{{{{\text{E}}_1}}} = {\left( {\frac{{{{\text{T}}_2}}}{{{{\text{T}}_1}}}} \right)^4} = 81.$$