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Monochromatic light of wave length 632.8nm is produced by a helium - neon laser. The power emitted is 9.42mw. How many photons per energy, on the average, arrive at a target irradiated by this beam ? (Assume the beam to have uniform cross - section which is less than the target area )

3×106photons/sec8×106photons/sec3×106photons/sec5×106photons/sec

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