Assertion (A) : Black body is an ideal body that emits and absorbs radiations of all frequencies. Reason (R) : The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature.

Options

A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true and R is not the correct explanation of A.
C. A is true and R is false.
D. Both A and R are false.

Explanation

Assertion is true and reason is false. The body which absorbs and emits all radiations at all frequency is called perfect black body. With rise in temperature, frequency increases.