Choose the correct optios.

Options

A. Good absorbers of a particular wavelength are good emitters of same wavelength. This statement was given by Kirchhoff.
B. At low temperature of a body the rate of cooling is directly proportional to temperature of the body. This statement was given by the Newton
C. Emissive power of a perfectly black body is 1
D. Absorptive power of a perfectly black body is 1

Answer

A, D

Explanation

(b) If temperature difference is small, the rate of cooling is proportional to TD.