Q2. Assertion (A): Black body is an ideal body that emits and absorbs radiation 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. Both A and R are true and R is the correct explanation of A. Both A and R are true but R is not the explanation of A A is true and R is false; Both A and R are false.
Answer. Correct Answer is (2.) Both A and R are true but R is not the correct explanation of A. A black body is an ideal body that emits and absorbs radiation of all frequencies, and the radiation emitted by such a body is known as black body radiation. The exact frequency distribution of a black body’s emitted radiation is determined solely by its temperature. At a given temperature, the intensity of radiation emitted increases as the wavelength decreases, reaches a maximum at a given wavelength, and then begins to decrease as the wavelength decreases further.
