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Standard XII
Physics
Energy Levels
Light from a ...
Question

Light from a discharge tube containing hydrogen atoms falls on the surface of a piece of sodium. The kinetic energy of the fastest photoelectrons emitted from sodium is 0.73 eV, The work function for sodium is 1.82 eV. Find the change in the angular momentum of the electron in the hydrogen atom in the above transition.

A
h/2π.
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B
h/3π.
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C
h/4π.
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D
h/π.
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Solution

The correct option is C h/π.
2008166_1011871_ans_2f5edc11b77f4687b98abdaa8ef0db26.PNG

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Q. Light from a discharge tube containing hydrogen atoms falls on the surface of a piece of sodium. The kinetic energy of the fastest photoelectrons emitted from sodium is 0.73 eV, The work function for sodium is 1.82 eV. Find the energy of the photons causing the photoelectric emissions.
Q. Light from a discharge tube containing hydrogen atoms falls on the surface of a piece of sodium. The kinetic energy of the fastest photoelectrons emitted from sodium is 0.73 eV, The work function for sodium is 1.82 eV. Find the quantum numbers of the two levels in the emission of the photon.
Q. Light from a discharge tube containing hydrogen atoms falls on the surface of a piece of sodium. The kinetic energy of the fastest photoelectrons emitted from sodium is 0.73 eV, The work function for sodium is 1.82 eV. Find the recoil speed of the emitting atom assuming it to be at rest before the transition.
(Ionization potential of hydrogen is 13.6 eV)
Q. Light from a discharge tube containing hydrogen atoms falls on the surface of a piece of sodium. The kinetic energy of the fastest photoelectrons emitted from sodium is 0.73 eV. The work function for sodium is 1.82 eV. The rocoil speed of emitting atom assuming it to be at rest before ionisation is (Ionisation potential of hydrogen is 13.6 eV).
Q. Light from a discharge tube containing hydrogen atoms falls on the surface of a piece of sodium. The kinetic energy of the fastest photo-electrons emitted from sodium is 0.73 eV. The work function for sodium is 1.82 eV. Find
(a) the energy of the photons causing photoelectric emission.
(b) the quantum numbers of the two levels involved in the emission of these photons.
(c) the change in the angular momentum of the hydrogen atom in the above transition, and
(d) the recoil speed of the emitting atom assuming it to be at rest before the transition. (lonization potential of hydrogen is 13.6 volt and the mass of the hydrogen atom is 1.67×10−27 kg, 1 eV=1.6×10−19 J).
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