Question

A radio station transmits isotropically (that is to say in all directions) electromagnetic radiation at the frequency of 98.6 MHz. At a certain distance from the radial station the intensity of the wave is I = 0.291 W / m^2. a) What will be the intensity of the wave at a quarter of the distance from the radio station? b) What is the wavelength of the transmitted signal? If the antenna power is 8 MW. c) At what distance from the source will the wave intensity be 0.146 W / m^2? d) What is the absorption pressure exerted by the wave at that distance? e) What is the effective electric field (rms) exerted by the wave at that distance?

Answer #1

1) Intensity is inversely proportional to distance from antena

so intensity at quarterly distance from radio station

2) wavelength of transmitted signal

c) so Power = 8MW

so at distance r intensity

so we get

d) reflaction pressure

e) so we know

so,

and

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