To analyze the experiment used to determine the properties of an electron. In 19

Question

To analyze the experiment used to determine the properties of an electron. In 1909, Robert Millikan performed an experiment involving tiny, charged drops of oil. The drops were charged because they had picked up extra electrons. Millikan was able to measure the charge on each drop in coulombs. Here is an example of what his data may have looked like. A single electron has a charge of 5.4 times 10-15Z. Using zeets and a fictitious unit of mass called the wiggle, w, the charge-to-mass ratio of an electron is 9.8 times 106Z/w. What is the mass of an electron in wiggles? Express the mass of an electron in wiggles using two significant figures.

Explanation / Answer

charge = 5.4 * 10^-15 Z charge/mass = 9.8*10^6 Z/w mass = charge/(9.8*10^6 ) = (5.4 * 10^-15)/(9.8*10^6 ) = 5.51 * 10^-22 wiggles

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