i) Contrast the processes of induced and spontaneous emission. We need to know the meaning of Einstein's coefficients.  ii) What is the frequency difference between the 20th and 21st resonant longitudinal modes if the cavity length is 20 cm?

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i) Contrast the processes of induced and spontaneous emission. We need to know the meaning of Einstein's coefficients. 


ii) What is the frequency difference between the 20th and 21st resonant longitudinal modes if the cavity length is 20 cm?

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