Question

Which of the following methods can be used to emit the electrons from the metal surface?

• A. Heating the metal
• B. Putting the metal under a strong electric field
• C. Falling radiation of required frequency on the metal surface
• D. All of these

Answer 1

The correct option is D All of these

Electrons can be emitted from the metal surface by providing the required amount of energy for the emission.

This required amount of energy can be given through heating the metal, putting the metal under a strong electric field or falling radiation of required frequency on the metal surface.

Hence, option $\left(D\right)$ is the correct answer.