NEET 2023 Physics Photoelectric Effect MCQ Question
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?
Both Na and K
K only
Na only
Cs only
Correct Answer
Detailed Explanation
Photoelectrons are emitted if the incident energy is greater than the work function. Only Cs has a work function less than 2.20 eV.
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