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

The velocity of an e 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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