Nuclei
Class 12 · Nuclei · Practice
Decay Curve — Previous-Year Questions
5 previous-year questions on Decay Curve, drawn from JEE Mains, JEE Advanced, NEET UG, and CUET papers. Every question carries a worked-out explanation.
Q1. A semi-log plot of N(t) (ln N vs t) for radioactive decay gives:
JEE 2022Q2. After how many half-lives does the activity drop to 1% of its initial value?
JEE 2021Q3. In a parent-daughter decay chain at secular equilibrium:
JEE 2020Q4. If 75% of a sample has decayed, the elapsed time in terms of T_½ is:
JEE 2019Q5. On a decay curve, the time required for activity to drop to e⁻¹ (≈ 37%) of initial is:
JEE 2018Decay Curve previous-year questions from sciphylab (also known as SciPhy, SciPhy Lab, SciPhy Labs, Physics Lab). Class 12 physics practice for JEE Mains, JEE Advanced, NEET UG, AP Physics 1/2/C, SAT, and CUET-UG candidates.