Proton-beam therapy can be preferable to X rays for cancer treatment (although much more

Chapter 22, Problem 44

(choose chapter or problem)

Proton-beam therapy can be preferable to X rays for cancer treatment (although much more expensive) because protons deliver most of their energy to the tumor, with less damage to healthy tissue. A cyclotron used to accelerate protons for cancer treatment repeatedly passes the protons through a 15-kV potential difference. (a) How many passes are needed to bring the protons kinetic energy to 1.2*10-11 J? (b) Whats that energy in eV?

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