A photoelectron is moving with a maximum velocity of \( 10^{6} \) \( \mathrm{m} / \mathrm{s} \)....

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A photoelectron is moving with a maximum velocity of \( 10^{6} \) \( \mathrm{m} / \mathrm{s} \). Given \( \mathrm{e}=1.6 \times 10^{-19} \mathrm{C} \), and \( m=9.1 \times 10^{-31} \mathrm{~kg} \), the stopping potential is
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