
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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12. What is the wavelength of the photons produced in electron-positron pair annihilation?
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- 5. Which of the four interactions (strong, electromagnetic, weak, gravitational) does the electron take part in? The neutrino? The proton? 6. Quarks have spin 1/2. How do you account for the fact that baryons have spin 1/2 or 3/2, and mesons have spin 0 or 1?arrow_forwardProblem 9. Explain why the fact that the electron emitted in the decay of a neutron has a range of energies rather than En - Ep (apparently violating energy conservation) led to the discovery of the neutrino.arrow_forward2. State any three conservation laws that restrict a reaction from happening in particle physics and explain how they restrict reactions.arrow_forward
- 7. What are the wavelengths of the two photons produced when a proton and antiproton annihilate? 8. The A° cannot decay by the following reactions. What conservation laws are violated in each of the reactions? (а) Л° - п+п-. (b) A° + p+ K¯. (c) A° + n+ + T¯.arrow_forwardThe reaction below describes an antiquark decaying into other particles. The X represents an unknown particle. d → ū + e + X a. What must be the charge of X? b. What must be the baryon number of X? c. What must be the lepton number of X? d. What is particle X?arrow_forward5. Pion beams (*) are used to treat cancer in radiation therapy. The energy comes from the decay of the pions. Negative pions usually decay into a muon and a muon antineutrino. (a) (b) Write out the complete decay of a л into stable particles. How much energy is released from a complete decay? Assume the neutrino masses are negligible. (c) How many pions need to decay to give a dose of 50.0 Gy to 10.0 grams of tissue?arrow_forward
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