In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

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.

  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 explanation of A.
  3. A is true and R is false.
  4. Both A and R are false.

Answers (1)

The answer is the option (ii) Both A and R are true, but R is not the explanation of A.

Explanation: A black body is the ideal body, that can emit and absorb the radiations of all frequencies, while the radiation emitted by such a body is known as the black body radiation. The emitted radiation’s specific frequency distribution from a black body is dependent on its temperature. At any given temperature, there is an increase in the intensity of the radiation emitted when the wavelength reaches a maximum value at a given wavelength and then starts reducing with a further reduction of wavelength.

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