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 recelved 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.
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 recelved 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.
College Physics
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ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
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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 recelved 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
[0.00000000000000000 Units
(b) Number
[24540000000000000
Units
W
the tolerance is +/-5%
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