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# What is the diameter of the radar beam at a distance of 30.0 km ?

A radar for tracking aircraft broadcasts at 12 GHz microwave beam from a 2.0-m-diameter circular radar antenna. From a wave perspective, the antenna is a circular aperture through which the microwaves diffracts.

A. what is the diameter of the radar beam at a distance of 30 km?

B. if the antenna emits 100 kW of power what is the average microwave intensity at 30 km?