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Monochromatic light of wavelength 667 nm is produced by a helium neon laser The power...

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Monochromatic light of wavelength 667 nm is produced by a helium neon laser The power emitted is 9 mW The number of photons arriving per sec On the average at a target irradiated by this beam AIPMT Prelims 2009 is 2 9 1015 4 9 1017 1 3 1016 3 3 1019

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