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Assertion : A body that is a good radiat...

Assertion : A body that is a good radiator is also a good absorber of radiation at a given wavelength.
Reason : According to Kirchhoff's law the absorptivity of a body is equal to its emissivity at a given wavelength

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion

C

If assertion is true reason is false

D

If the assertion and reason both are false.

Text Solution

Verified by Experts

The correct Answer is:
A
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Knowledge Check

  • Assertion : Black body is an ideal body that emits and absorbs radiations of all frequencies. Reason : The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • Assertion : Perspiration from human body helps in cooling the body. Reason : A thin layer of water on the skin enhances its emissivity.

    A
    If both the assertion and reason are true and reason is the correct explanation of the assertion.
    B
    If both the assertion and reason are true but the reason is not correct explanation of the assertion.
    C
    If the assertion is true but the reason is false
    D
    If the both the assertion and reason are false.

  • A body, which emits radiations of all possible wavelengths, is known as

    A
    Good conductor
    B
    Partial radiator
    C
    Absorber of photons
    D
    Perfectly black-body

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    Explore conceptually related problems

    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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