A physicist has developed a device that generates a beam ofalpha particles (each of which is a helium nucleus, consisting oftwo protons, two neutrons, and no electrons). The device ejects asteady stream of 4910 alpha particles per second. You are testingdifferent shielding materials for a test chamber that will housethe alpha particle generator. You prepare a sheet of one potentialmaterial in an electrically neutral state, mount it on a perfectlyinsulating stand, and fire the alpha particle device at it for 17.3seconds. Afterward, you measure that the charge of the sheet is6.39 × 10-15 coulombs. Assume that none of the alpha particlesbounced back from the sheet, meaning that the alpha particleseither were captured by the shielding or penetrated completelythrough the shielding. What percentage of the alpha particlespenetrated completely through the shielding material?
