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Dual Nature of Radiation and Matter question

2016 · Q136
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Dual Nature of Radiation and Matter question

2016 · Q136

NEETPhysicsDual Nature of Radiation and MatterMCQ+4 / −1
Photons with energy 5 eV are incifent on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on C, no photoelectrons will reach the anode A, if the stopping potential of A relative to C is
  1. A
    + 3 V
  2. B
    +4 V
  3. C
    −-−1 V
  4. D
    −-−3 V
View written solutionFree

Correct answer: D

Stopping potential is the voltage which is needed to stop energetic photo electron for reaching towards cathode.

Stopping potential, ϕ\phi ϕ = E – Kmax

2 eV = 5 eV – ϕ\phi ϕ or ϕ\phi ϕ = 3 eV

Now eV0 = E' – ϕ\phi ϕ = 6 eV – 3 eV = 3 eV

Hence stopping potential is –3V

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