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Electron, Photon, Photo-electric Effect and X-Rays — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsElectron, Photon, Photo-electric Effect and X-Rays1 Mark
MCQ
When the light source is kept $20 \mathrm{~cm}$ away from a photo cell, stopping potential $0.6 \mathrm{~V}$ is obtained. When source is kept $40 \mathrm{~cm}$ away, the stopping potential will be
  • A
    $0.3 \mathrm{~V}$
  • ✓
    $0.6 \mathrm{~V}$
  • C
    $1.2 \mathrm{~V}$
  • D
    $2.4 \mathrm{~V}$
✓

Answer

Correct option: B.
$0.6 \mathrm{~V}$
Stopping potential does not depend on the relative distance between the source and the cell.

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