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Electrons in hydrogen-like atom \( (Z=3) \) make transitions from the fifth to the fourth orbit and from the fourth to the third orbit. The resulting radiations are incident normally on a
\( P \) metal plate and eject photoelectrons. The stopping potential for the photoelectrons ejected by the shorter wavelength is
W) \( 3.95 \mathrm{~V} \). Calculate the work function of the metal, and the stopping potential for the photoelectrons ejected by the longer wavelength (Rydberg's constant \( =1.094 \times 10^{7} \mathrm{~m}^{-1} \) )
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