Proton-beam therapy is a treatment in which high-energy protons are fired at a tumor. upon colliding with the tumor, the protons kinetic energy is used to break apart the tumors dna and kill its cells. suppose a particular tumor requires 0.10 j worth of proton kinetic energy to be sufficiently destroyed. and suppose that the protons are accelerated from rest through a 10 mv (megavolt) potential difference when fired at the tumor. How many protons need to be fired at the tumor in this way to destroy it? An order-of-magnitude estimate is sufficient.
[electric potential, potential energy, voltage, energy conservation]