Fundamentholfundamenthol

NEET 2023, Physics Q10: Introduction and Photoelectric Effect

NEET2023Physics
Q.

The work functions of Caesium (Cs), Potassium (K) and Sodium (Na) are eV, eV and eV respectively. If incident electromagnetic radiation has an incident energy of eV, which of these photosensitive surfaces may emit photoelectrons?

  1. A

    Both Na and K

  2. B

    K only

  3. C

    Na only

  4. D

    Cs only

Solution

Photoemission requires the incident photon energy to exceed the work function: .

Incident energy eV. Comparing with : Cs () — emission possible; K () — no; Na () — no.

Only Cs emits photoelectrons.

Concept behind this question

Introduction and Photoelectric EffectNotes, formulas and examples →

More previous year questions on Introduction and Photoelectric Effect

Practice more Physics

Concept-wise practice with instant solutions on Fundamenthol.

Start practicing →