The speed of the electron in a hydrogen atom in the $n=3$ level is (Planck constant $= 6.6 \times 10^{-34} \ J \ s$):
- A$6.2 \times 10^5 \ m/s$
- B$3.7 \times 10^5 \ m/s$
- C$7.3 \times 10^5 \ m/s$
- D$1.6 \times 10^5 \ m/s$
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