A) white
B) red
C) green
D) invisible
Correct Answer: C
Solution :
From Kirchhoffs law at a definite temperature and for a given wavelength, the ratio of the emissive power to the absorptive power for different surfaces is same. \[ie,\] \[\frac{{{e}_{\lambda }}}{{{a}_{\lambda }}}={{E}_{\lambda }}\] When red glass is heated in a dark room to a red hoi stale it will appear green, because according to Kirchhoffs law the emissive power of red glass will be maximum for green light.
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