NEET UG 2020 · Physics · Question 157
NEET 2020 Physics, question 157
Question 157 of the NEET 2020 paper (code E1) is a Physics question from Dual Nature of Radiation and Matter. Its idea, Threshold Wavelength Condition, was asked twice, in 2020 and 2026, across NEET 2017–2026. The NTA final answer key gives option 4.
Updated 2026-10-08
Q157 · Physics
Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled ?
- 1doubled
- 2four times
- 3one-fourth
- 4zeroOfficial answer
Official answer: option 4 · NTA final answer key
Same idea
Threshold Wavelength Condition, in other papers
NEET asked this idea twice, in 2020 and 2026. The other question below.
- 2026 Q18A ray of light with wavelength is incident on three different photo-electric cells namely 1, 2 and 3. The threshold wavelength…One-line MCQ · Medium
Threshold Wavelength Condition: 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.