A 23.7-mw laser beam of diameter 2.11 mm is reflected at, Ask an Expert

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A Marconi antenna, used by most AM radio stations, consists of the top half of a Hertz antenna (also known as a half-wave antenna because its length is λ/2). The lower end of this Marconi (quarter-wave) antenna is connected to Earth ground, and the ground itself serves as the missing lower half.
(a) What is the height of the Marconi antennas for radio stations broadcasting at 614 kHz.

(b) What is the height of the Marconi antennas for radio stations broadcasting at 1 730 kHz.

A 23.7-mW laser beam of diameter 2.11 mm is reflected at normal incidence by a perfectly reflecting mirror. find out the radiation pressure on the mirror.

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