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Question

A certain substance emits only the wavelengths λ1,λ2,λ3 and λ4 when it is at a high temperature. When this substance is at a lower temperature, it will absorb which of the following wavelengths?

A
λ1
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B
λ2
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C
λ1 and λ2
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D
λ1,λ2,λ3 and λ4
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Solution

The correct option is D λ1,λ2,λ3 and λ4
Let e be the emissivity and a be the absorptive power of the body.

From Kirchhoff's law,
e=a
It means, if a substance emits a certain wavelength at a high temperature, it absorbs the same wavelengths at considerably lower temperature.

From question, the substance emits only the wavelengths λ1,λ2,λ3 and λ4. This means that the substance will absorb the same wavelengths at lower temperature.

Thus, option (d) is the correct answer.

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