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NEET 2023
Exam
NEET
Year
2023
Subject
Physics
Chapter
Dual Nature of Matter

NEET 2023 · Physics · Dual Nature of Matter

The work functions of Caesium ( Cs ) , Potassium ( K ) and Sodium (...

The work functions of Caesium (Cs)( Cs ), Potassium(K)( K ) and Sodium (Na)( Na ) 2.14eV,2.30eVand2.75eV2 . 14eV, 2 . 30eV\text{and}2 . 75eV are respectively. If incident electromagnetic radiation has an incident energy of 2.20eV2 . 20eV, which of these photosensitive surfaces may emit photoelectrons?

Options

  1. ANaonlyNa\text{only}
  2. BCsonlyCs\text{only}
  3. CBothNaandK\text{Both}Na\text{and}K
  4. DKonlyK\text{only}

Correct answer

B. CsonlyCs\text{only}

Step-by-step solution

For emission of photoelectrons, incident photon energy should be more than the work function of the metal.

Given:

hν=2.20eVhν = 2 . 20eV.

Clearly,

hν>ϕCshν > {ϕ}_{Cs} but hν<ϕKhν < {ϕ}_{K} and hν<ϕNahν < {ϕ}_{Na}.

Therefore, only CsCs will emit photoelectrons.

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