In proton beam therapy, a beam of high-energy protons is used tokill cancerous cells in a tumor. In one system, the beam, whichconsists of protons with an energy of 2.8×10−11J, has a current of72 nA. The protons in the beam mostly come to rest within thetumor. The radiologist has ordered a total dose corresponding to3.8×10−3J of energy to be deposited in the tumor.
Part A How many protons strike the tumor each second? Expressyour answer as a number of protons.
Part B: How long should the beam be on in order to deliver therequired dose?
