Speed of the electron in a Bohr orbit (v proportional to Z over n)

1. A.
   $1:1$
2. B.
   $1:2$
3. C.
   $4:1$
4. D.
   $2:1$

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1. A.
   $\left( 1.8 \times 10^{6} \right)$
2. B.
   $\left( 3.6 \times 10^{6} \right)$
3. C.
   $\left( 7.5 \times 10^{6} \right)$
4. D.
   $\left( 8.4 \times 10^{6} \right)$

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