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 hydrogen atom in the ground state. Find the velocity of the photoelectron.
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