Nuclear Physics And Radioactivity Question 363
Question: 10 gm of radioactive material of half-life 15 year is kept in store for 20 years. The disintegrated material is [Pb. PMT 2002]
Options:
A) 12.5 g
B) 10.5 g
C) 6.03 g
D) 4.03 g
Show Answer
Answer:
Correct Answer: C
Solution:
Remaining material $ N=\frac{N_{0}}{{{2}^{t/T}}} $
$ \Rightarrow N=\frac{10}{{{(2)}^{20/15}}}=\frac{10}{2.15}=3.96\ gm $ So decayed material $ =10-3.96=6.04\ gm $
BETA
