Q.

An incandescent lamp is operating at a temperature of 1000K at an operating frequency of 5.2×1014 Hz. Calculate the ratio of stimulated emission rate to spontaneous emission rate.

A. 3×10-13
B. 1.47×10-11
C. 2×10-12
D. 1.5×10-13
Answer» B. 1.47×10-11
Explanation: the ratio of the stimulated emission rate to the spontaneous emission rate is given by-
2.4k
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