Large radio telescopes, like the one in Arecibo, Puerto Rico, can detect extremely weak signals. Suppose one radio telescope is sensitive enough to detect a signal which lays down only 1.2 pW of power on an area of 5.4 x 1011 m². (a) What would be the total power that would be received by the antenna, assuming that its diameter is 240 m? (b) What would be the power of a source at 30000 ly distance from Earth that could provide such a signal? A light-year is the distance light travels in one year.

Large radio telescopes, like the one in Arecibo, Puerto Rico, can detect extremely weak signals. Suppose one radio telescope is sensitive enough to detect a signal which lays down only 1.2 pW of power on an area of 5.4 x 1011 m². (a) What would be the total power that would be received by the antenna, assuming that its diameter is 240 m? (b) What would be the power of a source at 30000 ly distance from Earth that could provide such a signal? A light-year is the distance light travels in one year.

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter25: Television, Telephone, And Low-voltage Signal Systems

Section25.1: Television Circuit

Problem 7R

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