Large radio telescopes, like the one in Arecibo, Puerto Rico, can detect Suppose one radio telescope is sensitive enough to detect a signal whic power on an area of 4.0 x 1016 m2. (a) What would be the total powe antenna, assuming that its diameter is 400 m? (b) What would be the distance from Earth that could provide such a signal? A light-year is the

Principles of Physics: A Calculus-Based Text
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ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
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Chapter24: Electromagnetic Waves
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*Chapter 33, Problem 016
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 0.97 pW of
power on an area of 4.0 x 1016 m2. (a) What would be the total power that would be received by the
antenna, assuming that its diameter is 400 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.
(a) Number
1 Units
(b) Number
12 Units
Transcribed Image Text:*Chapter 33, Problem 016 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 0.97 pW of power on an area of 4.0 x 1016 m2. (a) What would be the total power that would be received by the antenna, assuming that its diameter is 400 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. (a) Number 1 Units (b) Number 12 Units
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