A) white
B) red
C) green
D) yellow
Correct Answer: C
Solution :
According to Kirchoff's law at a definite temperature and for a given wavelength, the ratio of the emissive power to the absorptive power for different surface is same. i.e., \[\frac{{{e}_{\lambda }}}{{{a}_{\lambda }}}=E\lambda \] If red glass is heated in dark room to a red hot state it will appear green, because according to Kirchoffs law the emissive power of red glass will be maximum for the green light.
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