What is the speed of an electron in the n = 4 Bohr orbit of the hydrogen atom?
A) 5.47 × 105 m/s
B) 310 × 105 m/s
C) 1.39 × 105 m/s
D) 1.78 × 105 m/s
E) 2.18 × 106 m/s
A
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