A microwave source and a parabolic reflector produce a parallel beam of 10,000 megahertz radiation 20 cm in diameter. Th

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A Microwave Source And A Parabolic Reflector Produce A Parallel Beam Of 10 000 Megahertz Radiation 20 Cm In Diameter Th 1 (135.14 KiB) Viewed 54 times

A Microwave Source And A Parabolic Reflector Produce A Parallel Beam Of 10 000 Megahertz Radiation 20 Cm In Diameter Th 2 (301.63 KiB) Viewed 54 times

A microwave source and a parabolic reflector produce a parallel beam of 10,000 megahertz radiation 20 cm in diameter. The radiation in the beam is emitted as pulses 10-9 seconds long, with a total energy of 10-3 joules per pulse. Z 20 cm х

т (a) During the pulse the waves have an electric field E Em sin(wt – kx)ĉ with constant amplitude Em. Find w and k. (b) Write an expression for the B field of the wave (magnitude and direction) in terms of Em, w and k. (c) What is the numerical value of the average energy per unit volume inside a pulse? (d) All of the beam strikes a detector at right angles to the beam, which absorbs 80% of the radiation and reflects 20% of the radiation. What is the force exerted on the detector during a pulse? (e) Suppose that instead of hitting the detector, the pulse is incident on a single-loop, circular antenna with a radius r that is small compared to the wavelength of the radiation. The antenna picks up a signal from time-varying magnetic flux passing through the loop, which generates an emf via Faraday's law. Find the maximum emf that can be generated in the antenna. (f) How should the antenna be oriented to realize the maximum emf obtained in part (e)?