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

Explanation

Assertion is true nd reason is false
A body which absorbs and emits all radiations falling on it is called perfect black body. With rise in temperature, frequency increases.