The velocity of an e^- in excited state ...

The velocity of an `e^-` in excited state of H atom is `1.093xx10^6`m/s what is the circumference of this orbit?

`3.32xx10^-10`m

`6.64xx10^-10`m

`1.33xx10^-9`m

`13.28xx10^-8`m

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