The work functions of Caesium (Cs), Potassium (K) and Sodium (Na) are 2.14 eV 2 .30 eV and 2.75 eV respectively. If incident electromagnetic radiation has an incident energy of 2.20 eV. Which of these photosensitive surfaces may emit photoelectrons?
Text Solution
Verified by ExpertsThe correct answer is:
D
Given
Energy of incident radiation 
Work function of 
Work function of 
Work function of 
As we know that the 
emits when 
Since the work function of potassium and sodium are more than energy of incident radiation hence photons may be emitted from caesium.
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