Sodium and copper have work functions 2.3 eV and 4.5 eV res…

Physics Electron, Photon, Photoelectric Effect and X-rays Photon and Photoelectric Effect Single Correct MCQ

Published on: September 12, 2026

Sodium and copper have work functions 2.3 eV and 4.5 eV respectively. Then the ratio of their threshold wavelengths is nearest to

1 : 2

4 : 1

2 : 1

1 : 4

Text Solution

Verified by Experts

The correct answer is:

Work function
[Here they are interested in asking threshold wavelength]
where, Planck's constant, velocity of light.
Therefore,

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