AIPMT PRELIMS2003Chemistry-Nuclear Chemistry
AIPMT PRELIMS 2003 Chemistry Radioactive Decay MCQ Question
Type: MCQ-numerical-Medium-Class 12
The radioisotope, tritium (₁³H) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many milligrams of its would remain after 49.2 years :
A
1 mg
B
2 mg
C
4 mg
D
8 mg
Correct Answer
Option B
Detailed Explanation
49.2 years is 4 half-lives (49.2/12.3). After 4 half-lives, the amount remaining is 32 mg / 2⁴ = 2 mg.
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