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Photon having energy equivalent to the binding energy of 4th state of `He^(+)` ion is used to eject an electron from the metal with KE/2eV . If electron is further accelerated through a potential difference of 4V then the minimum value of de Broglie wavelength associated with the electron is :
(h = `6.6 xx 10^(-34) J-s , m_(e) = 9.1 xx 10^(-31)` kg . 1 eV = `1.6 xx 10^(-19)` J )

A

`1.1 "Å"`

B

`5 "Å"`

C

`9.15 "Å"`

D

`11 "Å"`

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The correct Answer is:
B
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