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A stationary helium ion emits a photon c...

A stationary helium ion emits a photon corresponding to the first line of Lyman series. That photon liberates a photoelectron form a stationary hydrogen atom in ground state. Find the velocity of photoelectron. Take mass of electron `=9.11xx10^(-31)kg` and ionisation energy of hydrogen atom=13.6ev.

A

`1.5 xx 10^(6)` m/s

B

`3.1 xx 10^(6)` m/s

C

`4.5 xx 10^(6)` m/s

D

`6.2 xx 10^(7)` m/s

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The correct Answer is:
B
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