NEET UG 2025 · Physics · Question 38
NEET 2025 Physics, question 38
Question 38 of the NEET 2025 paper (code 45) is a Physics question from Dual Nature of Radiation and Matter. Its idea, Effect of Intensity vs. Frequency, was asked twice, in 2025 and 2026, across NEET 2017–2026. The NTA final answer key gives option 1.
Updated 2026-10-08
Q38 · Physics
Which of the following options represent the variation of photoelectric current with property of light shown on the x-axis?
A. [graph: photoelectric current vs intensity of light, straight line through origin]
B. [graph: photoelectric current vs intensity of light, horizontal line (constant)]
C. [graph: photoelectric current vs frequency of light, straight line through origin]
D. [graph: photoelectric current vs frequency of light, straight line starting at a non-zero frequency on the x-axis]
The figure, described in words
Four graphs A-D of photoelectric current: A vs intensity linear through origin; B vs intensity flat; C vs frequency linear through origin; D vs frequency linear from a threshold frequency.
- 1A onlyOfficial answer
- 2A and C
- 3A and D
- 4B and D
Official answer: option 1 · NTA final answer key
Same idea
Effect of Intensity vs. Frequency, in other papers
NEET asked this idea twice, in 2025 and 2026. The other question below.
- 2026 Q8A beam of light falls on a metal surface such that photo-electrons are generated. If power of the light source starts to decrease linearly…Figure-based · Medium
Effect of Intensity vs. Frequency: 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.