NEET UG 2023 · Physics · Question 1
NEET 2023 Physics, question 1
Question 1 of the NEET 2023 paper (code G6) is a Physics question from Dual Nature of Radiation and Matter. Its idea, Work Function and Threshold, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 2.
Updated 2026-10-08
Q1 · Physics
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?
- 1Na only
- 2Cs onlyOfficial answer
- 3Both Na and K
- 4K only
Official answer: option 2 · NTA final answer key
Same idea
The only question on Work Function and Threshold
No other NEET paper from 2017–2026 tested this exact idea.
Work Function and Threshold: every question and how it was framed
The chapter
Dual Nature of Radiation and Matter in ten years of NEET
20 questions from 2017–2026, asked in 10 of 10 papers, about 1.9 a paper. Photoelectric Effect alone had 20.