Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 21, Problem 33Q
To determine
The way in which Doppler shift differs from gravitational redshift.
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How does a gravitational red-shift differ from a Doppler red shift?
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Chapter 21 Solutions
Universe
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- Show that no matter how big a redshift (z) we measure, v/c will never be greater than 1. (In other words, no galaxy we observe can be moving away faster than the speed of light.)arrow_forwardIf general relativity offers the best description of what happens in the presence of gravity, why do physicists still make use of Newton’s equations in describing gravitational forces on Earth (when building a bridge, for example)?arrow_forwardWhat is the fate of a closed universe? In what case would that not be true?arrow_forward
- A student becomes so excited by the whole idea of black holes that he decides to jump into one. It has a mass 10 times the mass of our Sun. What is the trip like for him? What is it like for the rest of the class, watching from afar?arrow_forwardWhy are gravitational waves so difficult to detect?arrow_forwardGiven an object is receding from Earth at v=20(10^3)km x s^-1, Calculate its redshift z?arrow_forward
- Do binary stars (double-star systems that orbit about a common center of mass) radiate gravitational waves? Why or why not?arrow_forwardAn astronaut takes a trip to Sirius, which is located a distance of 8 light-years from the Earth. The astronaut measures the time of the one-way journey to be 6 years. If the spaceship moves at a constant speed of 0.8c, how can the 8-ly distance be reconciled with the 6-year trip time measured by the astronaut?arrow_forwardWhy are gravitational waves hard to detect and is there a way to simplify the process? How?arrow_forward
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