Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Dual Nature of Radiation and Matter

Question:

The work function of caesium is 2 eV. This implies : 

 

Options:

It requires 2 eV energy for a cesium electron to jump from valence band to conduction band.

It requires maximum 2 eV for an electron to break apart from the cesium surface.

Both 1 and 2

It requires minimum 2 eV for an electron to emit from cesium surface.

Correct Answer:

It requires minimum 2 eV for an electron to emit from cesium surface.

Explanation:

Work function is defined as the minimum amount of energy needed by an electron to undergo photoemission.