University Physics with Modern Physics, Volume 2 (Chs. 21-37); Mastering Physics with Pearson eText -- ValuePack Access Card (14th Edition)
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Chapter 38, Problem 38.45PP
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Which option will generate higher-energy photons in this linear accelerator.

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Higher-energy photons might be desirable for the treatment of certain tumors. Which of these actions would generate higher-energy photons in this linear accelerator? (a) Increasing the number of electrons that hit the tungsten target; (b) accelerating the electrons through a higher potential difference; (c) both (a) and (b); (d) none of these.
Galactic cosmic rays (GCRs) in the 100 MeV-1.00 GeV energy range pose the greatest radiation danger to astronauts in Earth orbit or on future interplanetary missions. As we shall find in the chapter on nuclear physics, fast-moving protons are 10 times as effective in causing radiation damage as x-rays of the same energy. Approximately 85% of GCRS are fast-moving protons, and spacecraft traveling in interplanetary space would require thick shielding to attenuate not only the incident cosmic rays, but also the shower of secondary particles created when the cosmic ray particles impacted the shielding material. (a) What is the speed (in terms of c) of a 1.00 GeV cosmic ray proton? The rest mass of the proton is 938 MeV. The phrase "a 1.00 GeV cosmic ray proton" means that the kinetic energy of the proton is 1.00 GeV. As we contemplate space travel at relativistic speeds, we must consider the low-density abundance of atomic hydrogen in the interstellar medium (ISM), estimated to be…
Provide the answers in 90 minutes, and count as 2 questions if needed.

Chapter 38 Solutions

University Physics with Modern Physics, Volume 2 (Chs. 21-37); Mastering Physics with Pearson eText -- ValuePack Access Card (14th Edition)

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