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de-Brogile wavelength of an electron is ...

de-Brogile wavelength of an electron is `10 overset(@)A` then velocity will be-

A

`7.2xx10^(7)m//s`

B

`7.2xx10^(6)m//s`

C

`7.2xx10^(5)m//s`

D

`7.2xx10^(4)m//s`

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