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Though what voltage must a proton be accelerated from rest in order for the percent error between the relativistic kinetic energy of the proton and the classical kinetic energy of the proton to be 15.0%.

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In a television tube electrons are accelerated through a voltage of 5000 volts. What is the speed of the electrons assuming that they were initially at rest? (Since this is Physics 222, do not use special relativity to calculate the answer even though these speeds are a fraction of the speed of light.) Express your answer to the nearest km/s.
2. In proton-beam therapy, a high-energy beam of protons is fired at a tumor. The KE of the protons is used to kill cells in the tumor. For one patient, it is desired to deposit 0.1 J of proton energy into a tumor. To create the beam, proton at rest are accelerated through a potential difference of 10 MV (megavolts). a) What is the KE of a single proton fired at the tumor? b) How many protons must be fired at the tumor? ans. 6.25×1010 protons