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Large radio telescopes, like the one in Arecibo, Puerto Rico, can detect extremely weak signals. Suppose...

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Physics

Large radio telescopes, like the one in Arecibo, Puerto Rico,can detect extremely weak signals. Suppose one radio telescope issensitive enough to detect a signal which lays down only 1.3 pW ofpower on an area of 4.1 × 1013 m2.(a) What would be the total power that would bereceived by the antenna, assuming that its diameter is 340 m?(b) What would be the power of a source at 22000ly distance from Earth that could provide such a signal? Alight-year is the distance light travels in one year.

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4.5 Ratings (916 Votes)
a Here the intensity that would be received by the Arecibo antenna should be equal to intensity of that signal on earth Then    See Answer
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