21ST CENT.ASTRONOMY(LL)W/CODE WKBK PKG.
21ST CENT.ASTRONOMY(LL)W/CODE WKBK PKG.
6th Edition
ISBN: 9780393874921
Author: PALEN
Publisher: Norton, W. W. & Company, Inc.
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Chapter 18, Problem 43QP
To determine

The speed of photon beam arrived to the Earth.

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If you had light of wavelength 700nm when emitted (l0=700nm), what wavelength would an observer, who is moving away from the source with a speed v=0.05c, measure for that light?
An 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?
What is the wavelength, in fm (femtometers, or 10^-15 m), of a proton travelling at 90% of the speed of light?
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