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millimeter. 4. A pulsed laser emits light of wavelength A. For a pulse of duration At having energy TER, find (a) the physical length of

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millimeter. 4. A pulsed laser emits light of wavelength A. For a pulse of duration At having energy TER, find (a) the physical length of the pulse as it travels through space and (b) the number of photons in it. (c) The beam has a circular cross section having diameter d. Find the number of photons per unit volume

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