College Physics, Volume 1
College Physics, Volume 1
11th Edition
ISBN: 9781337653329
Author: Raymond A. Serway; Chris Vuille
Publisher: Cengage Learning US
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Chapter 30, Problem 21P

(a)

To determine

The minimum possible frequency.

(b)

To determine

The wavelength.

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In a pair-production reaction, a photon produces a proton-antiproton pair. Y → p + p The rest energy of a proton is 938.3 MeV. (a) What is the lowest possible frequency (in Hz) of the photon that can produce the proton-antiproton pair? Hz (b) What is the wavelength (in m) that corresponds to this lowest possible frequency?
Scientists observe a distant galaxy with a spectrometer. They find that the wavelength of the Lymann alpha Hydrogen line in the stars spectrum has shifted from its laboratory value of 121.6 nm to three times that value, 364.8 nm. According to the doppler effect, how fast is the galaxy receeding from us? (Find v/c of the galaxy relative to us).
Provide the answers in 90 minutes, and count as 2 questions if needed.
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