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Friday, 9 October

NEET UG 2022 · Physics · Question 31

NEET 2022 Physics, question 31

Question 31 of the NEET 2022 paper (code R1) is a Physics question from Dual Nature of Radiation and Matter. Its idea, Solving Two-State Photoelectric Equations, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 1.

Updated 2026-10-08

Q31 · Physics

When two monochromatic lights of frequency, ν\nu and ν2\frac{\nu}{2} are incident on a photoelectric metal, their stopping potential becomes Vs2\frac{V_s}{2} and VsV_s respectively. The threshold frequency for this metal is :

  1. 132ν\frac{3}{2}\nuOfficial answer
  2. 22ν2\nu
  3. 33ν3\nu
  4. 423ν\frac{2}{3}\nu

Official answer: option 1 · NTA final answer key

Same idea

The only question on Solving Two-State Photoelectric Equations

No other NEET paper from 2017–2026 tested this exact idea.

Solving Two-State Photoelectric Equations: 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.

Chapter analysisStudy this chapterPractise this chapter

Dual Nature of Radiation and Matter: questions per paper

0241’172’181’193’202’212’222’232’242’253’26