1. What is the de Broglie wavelength of a proton accelerated through a potential of $2.0 \times 10^4 V$? (A) 0.20 pm (B) 0.64 pm (C) 0.91 pm (D) 2.74 pm (E) 8.67 pm

7. In an electrolysis cell, a constant current of 1.90 A is passed through an aqueous $CuCl_2$ solution for 15.0 min. At the end of the experiment, 0.468 g of Cu(s) is obtained as the target reduction product. What fraction of the electrons passed through the circuit was successfully used to produce Cu(s)? (A) 20.8% (B) 41.6% (C) 62.4% (D) 83.1% (E) 100%

1. What is the de Broglie wavelength of a proton accelerated through a potential of $2.0 \times 10^4 V$?
(A) 0.20 pm
(B) 0.64 pm
(C) 0.91 pm
(D) 2.74 pm
(E) 8.67 pm

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