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Question

The photo-electric threshold wave length of a certain metal is 3000 Ao. If radiation of 2000 Ao is incident on the metal
  1. Protons will be emitted
  2. Electrons will be emitted
  3. Positrons will be emitted
  4. Electrons will not be emitted

A
Protons will be emitted
B
Electrons will be emitted
C
Electrons will not be emitted
D
Positrons will be emitted
Solution
Verified by Toppr

Threshold wavelength is 3000 A0, and incident ray has wavelength of 2000 A0. So, incident ray has less wavelength than the threshold wavelength. So, electrons will be emitted because at a threshold and less than threshold wavelength ejection of electrons takes place.
So, the answer is option (B).

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