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(D) According to Kirchhoff's law of radiation,a body that is a good emitter of radiation at a given temperature is also a good absorber of radiation a

Vedclass · Accepted Answer

${\lambda _1}, {\lambda _2}, {\lambda _3}$ and ${\lambda _4}$

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(D) According to Kirchhoff's law of radiation,a body that is a good emitter of radiation at a given temperature is also a good absorber of radiation at the same temperature.Specifically,if a substance emits certain discrete wavelengths at a high temperature,it will absorb those same specific wavelengths when it is at a lower temperature.Therefore,if the substance emits ${\lambda _1}, {\lambda _2}, {\lambda _3}$ and ${\lambda _4}$ at high temperatures,it will absorb the same set of wavelengths,${\lambda _1}, {\lambda _2}, {\lambda _3}$ and ${\lambda _4}$,when cold.The correct option is $D$.

$A$ certain substance emits only the wavelengths ${\lambda _1}, {\lambda _2}, {\lambda _3}$ and ${\lambda _4}$ when it is at a high temperature. When this substance is at a colder temperature,it will absorb only the following wavelengths:

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