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A pulsed source of microwave produces bursts of 20 GHz radiation, each burst lasts 1 ns....

A pulsed source of microwave produces bursts of 20 GHz radiation, each burst lasts 1 ns. A parabolic reflector of radius r = 2 cm is used to produce a parallel beam of radiation. The average output power of the source during each pulse is 18 kW.

Calculate the average momentum density in micro-joules.s/m4 (μ Js/m4). That is, multiply your final answer that has Js/m4 as a unit by 106, and then enter it.

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