Nuclear Physics And Radioactivity Question 344
Question: What fraction of a radioactive material will get disintegrated in a period of two half-lives [MP PET 2000]
Options:
A) Whole
B) Half
C) One-fourth
D) Three-fourth
Show Answer
Answer:
Correct Answer: D
Solution:
$ \frac{N}{N_{0}}={{( \frac{1}{2} )}^{n}},\ n=2\Rightarrow \frac{N}{N_{0}}={{( \frac{1}{2} )}^{2}}=\frac{1}{4} $ So disintegrated part $ =1-\frac{N}{N_{0}}=1-\frac{1}{4}=\frac{3}{4} $
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