A physicist has developed a device that generates a beam of alpha particles (eac

Question

A physicist has developed a device that generates a beam of alpha particles (each of which is a helium nucleus, consist rig of two protons, two neutrons, and no electrons). The device ejects a steady stream of 4910 alpha particles per second. You are testing different shielding materials for a test chamber that will house the alpha particle generator. You prepare a sheet of one potential material in an electrically neutral state, mount it on a perfectly Insulating stand, and fire the alpha particle device at It tor 37.3 seconds. Afterward, you measure that the charge of the sheet is 1.62 times 10^14 coulombs. Assume that none of the alpha particles bounced back from the sheet, meaning that the alpha particles either were captured by the shielding or penetrated completely through the shielding. What percentage of the alpha particles penetrated completely through the shielding material?

Explanation / Answer

alpha particels per second=4910

alpha particle in 37.3 sec=183143 alpha particles

charge on 1 alpha particles=2*1.6*10^(-19) C

charge on 183143 alpha particles=5.86*10^(-14) C

charge accumulated=1.62*10^(-14)

penerated charge=(5.86-1.62)*10^(-14) C=4.24*10^(-14) C

penerated alpha particles=(4.24/5.86)*100=72.35 percent

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