3. (Problem 5.7.4) A source of radio-frequency interference is discovered 4 km away from a radio telescope operating at a wavelength 20 cm. The receiver of the telescope and the offending transmitter are both 20 m above the ground. After some consideration of options, it is decided to mitigate the interference by building an opaque screen 500 m from the telescope. How high must the screen be if the power is to be reduced by a factor 100, compared to the case where the transmitter is completely unobstructed by the fence or ground? (Ignore reflections from the
3. (Problem 5.7.4) A source of radio-frequency interference is discovered 4 km away from a radio telescope operating at a wavelength 20 cm. The receiver of the telescope and the offending transmitter are both 20 m above the ground. After some consideration of options, it is decided to mitigate the interference by building an opaque screen 500 m from the telescope. How high must the screen be if the power is to be reduced by a factor 100, compared to the case where the transmitter is completely unobstructed by the fence or ground? (Ignore reflections from the
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Transcribed Image Text:3. (Problem 5.7.4) A source of radio-frequency interference is discovered 4 km away from a
radio telescope operating at a wavelength 20 cm. The receiver of the telescope and the offending
transmitter are both 20 m above the ground. After some consideration of options, it is decided
to mitigate the interference by building an opaque screen 500 m from the telescope. How high
must the screen be if the power is to be reduced by a factor 100, compared to the case where
the transmitter is completely unobstructed by the fence or ground? (Ignore reflections from the
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