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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.

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The correct Answer is:
`[v = 3.1 xx 10^(6)m//s`, where m is the mass of the electron]
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