72. By what potential difference must (a) a proton (m 1.67
Chapter 27, Problem 72(choose chapter or problem)
72. By what potential difference must (a) a proton (m 1.67 X 10-27 kg), and (b) an electron (m = 9.11 X 10-31 kg), be accelerated to have a wavelength A = 5.0 x 10l2m?
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