Answer: In proton-beam therapy, a high-energy beam of

Chapter 21, Problem 74

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In proton-beam therapy, a high-energy beam of protons is fired at a tumor. The protons come to rest in the tumor,depositing their kinetic energy and breaking apart the tumor'sDNA, thus killing its cells. For one patient, it is desired that0. 10 J of proton energy be deposited in a tumor. To create theproton beam, the protons are accelerated from rest through a I 0MY potential di fference. What is the total charge of the protonsthat must be fired at the tumor to deposit the required energy?

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