Electrons in a hydrogen like atom \( (Z=3) \) make transitions from...

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Electrons in a hydrogen like atom \( (Z=3) \) make transitions from the fourth excited state to the third excited state and from the third excited sate to the
\( \mathrm{P} \) second excited state. The resulting radiations are W incident on a metal plate and eject photoelectrons. The stopping potential for photoelectrons ejected by shorter wavelength is \( 3.95 \mathrm{eV} \). Calculate the stopping potential for the photoelectrons ejected by the longer wavelength.
(1) \( 0.85 \mathrm{eV} \)
(2) \( 0.75 \mathrm{eV} \)
(3) \( 0.65 \mathrm{eV} \)
(4) None of these
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