JEE Main 2023 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 10 April 2023, Shift 2, Physics Q44

Question 44 of 90 in this shift, Physics question 14 of 30, Section A.

The half life of a radioactive substance is T. The time taken, for disintegrating

\frac{7}{8}

th part of its original mass will be:

(1) $T$
(2) $2T$
(3) $3T$ Official answer
(4) $8T$

Official answer

Option 3

NTA final key.

Chapter: Nuclei
Topic: Radioactive Decay
Idea tested: Half-Life Calculations

Same idea in other shifts

Asked 10× in all

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.