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The energy of separation of an electron ...

The energy of separation of an electron in a hydrogen like atom in excited state is 3.4eV. The de-Broglie wave length (in Å) associated with 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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