NEET UG 2023 · Physics · Question 28
NEET 2023 Physics, question 28
Question 28 of the NEET 2023 paper (code G6) is a Physics question from Nuclei. Its idea, Half-Life and Decay Constant, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 1.
Updated 2026-10-08
Q28 · Physics
The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to of its initial value?
- 180 minutesOfficial answer
- 220 minutes
- 340 minutes
- 460 minutes
Official answer: option 1 · NTA final answer key
Same idea
The only question on Half-Life and Decay Constant
No other NEET paper from 2017–2026 tested this exact idea.
Half-Life and Decay Constant: every question and how it was framed
The chapter
Nuclei in ten years of NEET
13 questions from 2017–2026, asked in 9 of 10 papers, about 1.2 a paper. Radioactive Decay alone had 9.