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Standard XII
Physics
Question

Radiation from hydrogen gas excited to first excited state is used for illuminating certain photoelectric plate. When the radiation from some unknown hydrogen like gas excited to the same level is used to expose the same plate. It is found that the de-Broglie wavelength of the fastest photo-electron has decreased 2.3 times of its previous value. It is given that the energy corresponding to the longest wavelength of the Lyman series of the unknown gas is 3 times the ionization energy of hydrogen gas (13.6 eV). The work function of photoelectric plate is: (Take (2.3)2=5.25)
  1. 1 eV
  2. 2 eV
  3. 3 eV
  4. 4 eV

A
3 eV
B
1 eV
C
4 eV
D
2 eV
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