NEET2017Physics-Nuclear Physics
NEET 2017 Physics Radioactive Decay MCQ Question
Type: MCQ-numerical-Medium-Class 12
Radioactive material ‘A’ has decay constant ‘8λ’ and material ‘B’ has decay constant ‘λ’. Initially they have same number of nuclei. After what time, the ratio of number of nuclei of material ‘B’ to that ‘A’ will be 1/e?
A
1/λ
B
1/7λ
C
1/8λ
D
1/9λ
Correct Answer
Option B
Detailed Explanation
Using the decay law, N = N₀e^(-λt), the time when the ratio becomes 1/e can be calculated by setting the equations for both materials and solving for t.
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