Nuclear Physics And Radioactivity Question 329
Question: A radio isotope has a half life of 75 years. The fraction of the atoms of this material that would decay in 150 years will be [BHU 1997]
Options:
A) 66.6%
B) 85.5%
C) 62.5%
D) 75%
Show Answer
Answer:
Correct Answer: D
Solution:
Number of half lives in 150 years $ n=\frac{150}{75}=2 $ Fraction of the atom of decayed $ =1-{{( \frac{1}{2} )}^{n}} $ $ =1-{{( \frac{1}{2} )}^{2}}=\frac{3}{4}=0.75 $
Þ Percentage decay = 75%
BETA
