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An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photosensitive material having work function 2.75 eV. If the stopping potential of the photoelectron is 10 V, the value of n is
Options
(a) 3
(b) 4
(c) 5
(d) 2
Correct Answer:
4
Explanation:
KEₘₐₓ = 10 eV ? = 2.75 eV
Total incident energy
E = ? + KEₘₐₓ = 12.75 eV
Energy is released when electron jumps from the excited state n to the ground state.
E₄ – E₁ = {-0.85 – (-13.6) eV}
= 12.75 eV value of n = 4.
Related Questions: - Two point objects of masses 1.5 g and 2.5 g respectively are at a distance of 16 cm
- Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV.
- The minimum wavelength of X-rays emitted by X-ray tube is 0.4125Å
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Topics: Atoms and Nuclei
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two point objects of masses 1.5 g and 2.5 g respectively are at a distance of 16 cm
- Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV.
- The minimum wavelength of X-rays emitted by X-ray tube is 0.4125Å
- The escape velocity of a body from earth’s surface is Ve. The escape velocity
- A particle of mass m, charge Q and kinetic enery T enters a transverse
Topics: Atoms and Nuclei (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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