Question

If radiation of energy $5\text{eV}$ is incident on the material with work function of $2.5\text{eV}$ then,

• A. Electrons may come out of the metal.
• B. Electrons will be emitted definetly.
• C. No electrons will come out of the surface.
• D. can not be predicted.

Answer 1

The correct option is B Electrons will be emitted definetly.

The work function represents the minimum amount of energy that is required by electrons to come out.

If Energy > work function, the electrons will be emitted definetly

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

Why this question? This question tests knowledge about the basics of photo electron emission.