(i) Compare stimulated and spontaneous emission. What is the significance of Einstein's coefficients? (ii) Calculate the frequency difference between resonant longitudinal 20th mode and 21th mode, if the cavity length is 20 cm.

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(i) Compare stimulated and spontaneous emission.
What is the significance of Einstein's coefficients?
(ii) Calculate the frequency difference between
resonant longitudinal 20th mode and 21th mode, if the
cavity length is 20 cm.
Transcribed Image Text:(i) Compare stimulated and spontaneous emission. What is the significance of Einstein's coefficients? (ii) Calculate the frequency difference between resonant longitudinal 20th mode and 21th mode, if the cavity length is 20 cm.
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