Verified Solution • 2025–26 Session
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QNEET-2023-Ph-267: NEET 2023 Physics - Class 12 NEET-2023-Ph-267 Solution: The work functions of Caesium (Cs) potassium (K) and Sodium…
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
Multiple Choice Options
- A Both Na and K
- B K only
- C Na only
- D Cs only
Step-by-Step Verified Solution
Given energy of photon E = 2.20 eV
Work function of Cs _ 0 = 2.14 eV , K _ 0 = 2.30 eV , Na _ 0 = 2.75 eV
We know that e _ emitts when h v > _ 0
here it is clear that energy of photon is more than the work function of Cs [Caesium] only so Ans. only (Cs).