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.You need to login to perform this action.
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