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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 |
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