AIIMS2011Physics-Nuclear Physics
AIIMS 2011 Physics Radioactive Decay MCQ Question
Type: MCQ-numerical-Medium-Class 12
Half life of a radioactive material is 5 years, then the percentage of it remained after 25 years will be
A
3.125%
B
6.25%
C
1.25%
D
25%
Correct Answer
Option A
Detailed Explanation
Number of half lives, n = t / T1/2 = 5. Percentage of radioactive material remaining after 25 years is (1/2)^5 x 100 = 3.125%.
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