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From the rate of stimulated excitation (absorption) and rate of stimulated deexcitation (emission) equations, show that population inversion is required for light amplification. Write units

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From the rate of stimulated excitation (absorption) and rate of stimulated deexcitation (emission) equations, show that population inversion is required for light amplification. Write units for Einstein's A and B coefficients with brief explanation (7+3 m)

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