Half-Life — Previous-Year Questions
5 previous-year questions on Half-Life, drawn from JEE Mains, JEE Advanced, NEET UG, and CUET papers. Every question carries a worked-out explanation.
Q1. A radioactive sample has half-life 5 years. After 20 years, fraction remaining:
JEE 2022Q2. A sample's activity drops from 800 Bq to 100 Bq in 30 minutes. Half-life:
JEE 2021Q3. If a radioactive sample has a half-life of 8 hours, after 24 hours the activity is reduced by a factor of:
JEE 2020Q4. Carbon-14 in a bone is 1/16 of that in living tissue. Bone's age (T_½ = 5730 yr):
JEE 2019Q5. If decay constant of a nucleus is 0.1/day, its half-life:
JEE 2018Half-Life 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.