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.

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter27: Quantum Theory

Section: Chapter Questions

Problem 49A

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