JEE Main 2019 — Nuclear Physics Question with Solution
JEE Main 2019 (12 Apr Shift 2)
Question
Half lives of two radioactive nuclei and are 10 minutes and 20 minutes, respectively. If, initially a sample has equal number of nuclei, then after 60 minutes, the ratio of decayed numbers of nuclei A and B will be:
Choose an option
Show full solutionCorrect option: D
Correct answer
D
Step-by-step explanation
Half-life of : minutes
Number of half-lives in 60 minutes are:
Number of decayed nuclei of
Similarly, Half-life of : minutes
Number of half-lives of B in 60 minutes are:
Number of decayed nuclei of B
Number of half-lives in 60 minutes are:
Number of decayed nuclei of
Similarly, Half-life of : minutes
Number of half-lives of B in 60 minutes are:
Number of decayed nuclei of B
Practice this on the real CBT interface
Solve this JEE Main question (and the rest of the Nuclear Physics chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.
Solve interactively →About this question
This is a previous-year question from JEE Main 2019, covering the Nuclear Physics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.