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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(d)According to Kirchoff’s law in spectroscopy.
If a substance emit certain wavelengths at high temperature, it absorbs the same wavelength at comparatively lower temperature.
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