1. Tardigrade
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  3. Physics
  4. Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material photoelectric current is emitted. If the frequency of light is halved and intensity is doubled, the photoelectric current becomes:

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Q. Light of frequency $1.5$ times the threshold frequency is incident on a photosensitive material photoelectric current is emitted. If the frequency of light is halved and intensity is doubled, the photoelectric current becomes:

J & K CETJ & K CET 2001

Solution:

The minimum frequency of light which can emit photoelectrons from a material is called the threshold frequency of that material. If the frequency of incident light is less than threshold frequency $ (v_{0}) $ no photoelectrons are emitted whatever be the intensity of light. When frequency of incident light is halved, its frequency becomes $ \frac{v_{0}}{2} $ which is less than threshold frequency $ v_{0} $ . Hence, no photo- electric emission will take place.