ch24_p47 - 47. Let the distance in question be r. The...

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4 7. Let the distance in question be r . The initial kinetic energy of the electron is Km v ie i = 1 2 2 , where v i = 3.2 × 10 5 m/s. As the speed doubles, K becomes 4 K i . Thus ∆∆ U e r KK K K m v ii i e i = =− 2 2 4 43 3 2 π 0 ε () , or 2 2 2 19
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