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The velocity of an electron in excited s...

The velocity of an electron in excited state of H-atom is `1.093 xx 10^6` m/s, what is the circumference of this orbit?

A

`3.32xx10^(-10)` m

B

`6.64xx10^(-10)` m

C

`13.30xx10^(-10)` m

D

`13.28xx10^(-8)` m

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