Ncert Exercises & Solutions

Given below are two statements:

Assertion (A):	An ideal black body emits and absorbs radiation of every possible frequency.
Reason (R):	An increase in the temperature of a body causes its radiation spectrum to peak at progressively higher frequencies.

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	(A) is False but (R) is True.

Hint: With the temperature intensity of light increases.

Explanation:

A body that absorbs and emits all radiation falling on it is called a perfect black body. With rise in temperature, the frequency of radiation emitted by the body increases.

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