JEE Main 2022 · 26 Jun · Shift 2 · Physics Q48

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PhysicsSingle correct+4 / -1Question 48 of 90

A radioactive nucleus can decay by two different processes. Half-life for the first process is 3.0 hours while it is 4.5 hours for the second process. The effective half-life of the nucleus will be :

3.75 hours

0.56 hours

0.26 hours

1.80 hours

Answer and worked solution

Official answer: D

Parallel decay. $\dfrac1T=\dfrac13+\dfrac1{4.5}=\dfrac59$ , so $T=1.8$ h.

(D)

Topics:Radioactive decay

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JEE Main 2022 · 26 Jun · Shift 2, Physics question 48