7_Chapter 16 HomeworkCH17 Current and Resistance

7_Chapter 16 HomeworkCH17 Current and Resistance - Current...

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Current and Resistance 75 17.5 The period of the electron in its orbit is 2 r T v π = , and the current represented by the orbiting electron is () ( ) 61 9 3 11 2 2.19 10 m s 1.60 10 C 1.05 10 C s 1.05 mA 25 . 2 91 0 m ev e Q I tT r == = ×× × × = 17.6 The mass of a single gold atom is -22 -25 23 197 g mol 3.27 10 g 3.27 10 kg 6.02 10 atoms mol atom A M m N × The number of atoms deposited, and hence the number of ions moving to the negative electrode, is 3 21 -25 3.25 10 kg 9.93 10 3.27 10 kg atom m n m × = × × Thus, the current in the cell is ( ) 21 19 9.93 10 1.60 10 C 0.159 A
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