College Physics
College Physics
2nd Edition
ISBN: 9780134601823
Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan
Publisher: Pearson,
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Chapter 30, Problem 5P
To determine

The reason behind production of two photons instead of just one during the proton-electron annihilation.

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An electron and a positron meet and completely annihilate, creating two photons, each with the same energy. What is the wavelength of each of the photons?
A proton‑antiproton annihilation takes place, leaving two photons with a combined energy of 3.50 GeV. Find the kinetic energy Kp of the proton if the proton had the same kinetic energy as the antiproton. Kp = ? eV Find the kinetic energy K'p of the proton if the proton had 3.25 times as much kinetic energy as the antiproton. K'p = ? eV
3. (a) Verify that the minimum energy a photon must have to create an electron-positron pair in the presence of a stationary nucleus of mass M is 2mc2(1 + m/M), where m is the electron rest mass. (b) Find the minimum energy needed for pair production in the presence of a proton.

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