A stationary \( \mathrm{He}^{+} \)ion emitted a photon corresponding to the first line of the Ly...

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A stationary \( \mathrm{He}^{+} \)ion emitted a photon corresponding to the first line of the Lyman series. That photon liberated a photoelectron from a stationary \( \mathrm{H} \)-atom in ground state. What is the velocity of photoelectron?
\[
\left(R_{\mathrm{H}}=109678 \mathrm{~cm}^{-1}\right)
\]
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