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Category > Physics Posted 17 Jun 2017 My Price 10.00

A microwave source

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. [a] During the pulse the waves have an electric field E = E m sin[03t-kx)’z‘ with
constant amplitude Em. Find 0) and k. (b) Write an expression for the B field of the wave [magnitude and direction]
in terms of Em, 0) and k. [c] What is the numerical value of the average energy per unit volume inside
a pulse? [(1) 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’ 5 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]?

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SuperTutor
(15)
Status NEW Posted 17 Jun 2017 12:06 AM My Price 10.00

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