In proton beam therapy, a beam of high-energy protons is used to kill cancerous cells in a tumor. In one system, the beam, which consists of protons with an energy of 2.8 * 10-11 J, has a current of 80 nA. The protons in the beam mostly come to rest within the tumor. The radiologist has ordered a total dose corresponding to 3.6 * 10-3 J of energy to be deposited in the tumor. a. How many protons strike the tumor each second? b. How long should the beam be on in order to deliver the required dose?
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