Nuclear Physics And Radioactivity Question 322
Question: If half-life of a radioactive element is 3 hours, after 9 hours its activity becomes [RPMT 1997; RPET 1999]
Options:
A) 1/9
B) 1/27
C) 1/6
D) 1/8
Show Answer
Answer:
Correct Answer: D
Solution:
By using $ A=A_{0}{{( \frac{1}{2} )}^{\frac{t}{{T_{1/2}}}}} $
Þ $ \frac{A}{A_{0}}={{( \frac{1}{2} )}^{9/3}}=\frac{1}{8} $
BETA
