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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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The correct answer is:
$\lambda_1, \lambda_2, \lambda_3$ and $\lambda_4$
Let e be the emissivity and a be the absorptive power of the body.
From Kirchhoff's law, \(\mathrm{e}=\mathrm{a}\)
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 \(\lambda_1, \lambda_2, \lambda_3\) and \(\lambda_4\). This means that the substance will absorb the same wavelengths at lower temperature.
Thus, option (d) is the correct answer.
From Kirchhoff's law, \(\mathrm{e}=\mathrm{a}\)
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 \(\lambda_1, \lambda_2, \lambda_3\) and \(\lambda_4\). This means that the substance will absorb the same wavelengths at lower temperature.
Thus, option (d) is the correct answer.
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