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Electrons in hydrogen like atoms (Z = 3)...

Electrons in hydrogen like atoms (Z = 3) make transitions form the fifth to the fourth orbit and from the fourth to the third orbit. The resulting radiations are incident normally on a metal plate and eject photoelectrons. The stopping potential for the metal and the stopping potential for the photoelectrons ejected by the longer wavelength.

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.4 eV 17.85 eV
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