AIIMS 2017 Physics Black Body Radiation Assertion Reason Question
In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choice.
Assertion (A) Black body is an ideal body that emits and absorb radiations of all frequencies.
Reason (R) The frequency of radiations emitted by a body goes from lower frequency to higher frequency with an increase in temperature.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
Assertion is true but Reason is false.
Both Assertion and Reason are false.
Correct Answer
Detailed Explanation
Option C is correct because the assertion that a black body is an ideal emitter and absorber of all frequencies of radiation is true, while the reason provided is false; it inaccurately simplifies the relationship between temperature and emitted radiation. The correct principle is that as temperature increases, a black body emits radiation across a spectrum that shifts toward higher frequencies (or shorter wavelengths) according to Wien's displacement law, but this does not imply a sequential increase from lower to higher frequencies.
Option A is incorrect because, although both statements are true, the reason does not correctly explain the assertion. Option B is also incorrect for the same reason; while both statements are true, the relationship described in the reason does not clarify the assertion. Option D is incorrect as both statements are indeed true.
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