A metal plate is illuminated with light of a certain frequency. Which of the following determine whether or not electrons are ejected?

How long the plate is exposed to the light.

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The area of the plate.

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The intensity of the light.

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The material of which the plate is made.

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Solution

The correct option is D The material of which the plate is made.
Whether or not electrons are emitted will depend on the threshold frequency of the material. If the incident light is of a higher frequency than the threshold frequency, then the electrons will be emitted.

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A metal plate is exposed to light with wavelength $λ$ . It is observed that electrons are ejected from the surface of the plate. When a retarding uniform electric field $E$ is applied, no electron can move away from the plate farther than a certain distance $d$ . Then the threshold wavelength $λ_{0}$ for the material of plate is ( $e$ is the electronic charge, $h$ is the Plank’s constant and $c$ is the speed of light.)