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If the total energy of an electron in a hydrogen atom in an exicted state is -3.4 eV , then the de- broglie wavelegth of the electron is :-

A

`7.2xx10^(-10)m`

B

`3xx10^(-10)m`

C

`5xx10^(-9)m`

D

`9.3xx10^(-12)m`

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