The radius of the first Bohr orbit of a hydrogen atom is $0.53 \times 10^{-8} \ cm$. The velocity of the electron in the first Bohr orbit is
- A$2.188 \times 10^{8} \ cm \ s^{-1}$
- B$4.376 \times 10^{8} \ cm \ s^{-1}$
- C$1.094 \times 10^{8} \ cm \ s^{-1}$
- D$2.188 \times 10^{9} \ cm \ s^{-1}$
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