79. In proton-beam therapy, a high-energy beam of protons is BIO fired at a tumor. The protons come to rest in the tumor, deposit- ing their kinetic energy and breaking apart the tumor's DNA, thus killing its cells. For one patient, it is desired that 0.10 J of proton energy be deposited in a tumor. To create the proton beam, the protons are accelerated from rest through a 10 MV potential difference. What is the total charge of the protons that must be fired at the tumor to deposit the required energy?

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79. I In proton-beam therapy, a high-energy beam of protons is
BIO fired at a tumor. The protons come to rest in the tumor, deposit-
ing their kinetic energy and breaking apart the tumor's DNA,
thus killing its cells. For one patient, it is desired that 0.10 J
of proton energy be deposited in a tumor. To create the proton
beam, the protons are accelerated from rest through a 10 MV
potential difference. What is the total charge of the protons that
must be fired at the tumor to deposit the required energy?
80. A 2.5-mm-diameter sphere is charged to -4.5 nC. An elec-
tron fired directly at the sphere from far away comes to within
0.30 mm of the surface of the target before being reflected.
86
IN
87.
Transcribed Image Text:79. I In proton-beam therapy, a high-energy beam of protons is BIO fired at a tumor. The protons come to rest in the tumor, deposit- ing their kinetic energy and breaking apart the tumor's DNA, thus killing its cells. For one patient, it is desired that 0.10 J of proton energy be deposited in a tumor. To create the proton beam, the protons are accelerated from rest through a 10 MV potential difference. What is the total charge of the protons that must be fired at the tumor to deposit the required energy? 80. A 2.5-mm-diameter sphere is charged to -4.5 nC. An elec- tron fired directly at the sphere from far away comes to within 0.30 mm of the surface of the target before being reflected. 86 IN 87.
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