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General — Medium JEE physics MCQ

A heavy nucleus $Q$ of half-life 20 minutes undergoes alpha-decay with probability of $60 \%$ and beta-decay with probability of $40 \%$. Initially, the number of $Q$ nuclei is 1000. The number of alpha-decays of $Q$ in the first one hour is
  1. A. 50
  2. B. 75
  3. C. 350
  4. D. 525

Solution

The correct option is **D**.

PHYSICS

medium • PYQ Reworded
Question
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A heavy nucleus QQ of half-life 20 minutes undergoes alpha-decay with probability of 60%60 \% and beta-decay with probability of 40%40 \%. Initially, the number of QQ nuclei is 1000. The number of alpha-decays of QQ in the first one hour is
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General — Medium JEE Physics MCQ | MyGoalPrep