A pulsed ruby laser emits light at 694.3 nm . For a 14.0 -ps pulse containing 3.00 …

A pulsed ruby laser emits light at 694.3 nm . For a 14.0 -ps pulse containing 3.00 J of energy, 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 of diameter 0.600 cm . Find the number of photons per cubic millimeter.

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