Question
Question: 10 gm of radioactive material of half-life 15 year is kept in store for 20 years. The disintegrated ...
10 gm of radioactive material of half-life 15 year is kept in store for 20 years. The disintegrated material is.
A
12.5 g
B
10.5 g
C
6.03 g
D
4.03 g
Answer
6.03 g
Explanation
Solution
Remaining material N=2t/TN0
⇒N=(2)20/1510=2.1510=3.966mugm
So decayed material
=10−3.96=6.046mugm