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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.
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.
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Solution
The correct option is D Both A and R are true but R is not the correct explanation of A
Analyzing the Assertion.
Assertion:
Black body is an ideal body that emits and absorbs radiations of all frequencies
The ideal body, which emits and absorbs radiation of all frequencies is called a black body and the radiation emitted by such body is called black body radiation.
Analyzing the reason
Reason:
The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature.
The frequency distribution of the emitted radiation from a black body depends only on its temperature.
Frequency of radiations emitted is directly proportional to the temperature Thus, at lower temperature, frequency is low and as temperature increases the emitted frequency also increases.
Hence, the frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature. But, this doesn’t explain why black body emit and absorb radiation of all frequencies.
Hence, the given assertion statement is true and the given reason is also true but the reason is not the explanation of assertion
Hence the correct answer is option (B)
Analyzing the Assertion.
Assertion:
Black body is an ideal body that emits and absorbs radiations of all frequencies
The ideal body, which emits and absorbs radiation of all frequencies is called a black body and the radiation emitted by such body is called black body radiation.
Analyzing the reason
Reason:
The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature.
The frequency distribution of the emitted radiation from a black body depends only on its temperature.
Frequency of radiations emitted is directly proportional to the temperature Thus, at lower temperature, frequency is low and as temperature increases the emitted frequency also increases.
Hence, the frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature. But, this doesn’t explain why black body emit and absorb radiation of all frequencies.
Hence, the given assertion statement is true and the given reason is also true but the reason is not the explanation of assertion
Hence the correct answer is option (B)
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