A three level laser emits a light of wavelength 4500 The temperature at which the...

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A three level laser emits a light of wavelength 4500 The temperature at which the ratio of the population reduces to half is a 46244 K b 37800 K c 32000 K d 84872 K Hint h 6 63 x 10 34 Joule sec k 1 38 x 10 23 Joule kelvin

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