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A laser used to weld detached retina emits light with a wavelength 652 nm in pulses that are of 20 ms duration. The average power during each pulse is 0.6 W. The energy in each pulse and in a single photon are
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Correct option is D
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When a point light source, of power E emitting monochromatic light of wavelength is kept at a distance r from a photosensitive surface of work -function and area s, then number of photons striking the surface per unit time is
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