A) 0.151 gm
B) 0.32 gm
C) 1.51 gm
D) 0.16 gm
Correct Answer: B
Solution :
Number of half lives \[n=\frac{19}{3.8}=5;\]Now \[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{n}}\] \[\Rightarrow \frac{N}{10.38}={{\left( \frac{1}{2} \right)}^{5}}\Rightarrow N=10.38\times {{\left( \frac{1}{2} \right)}^{5}}\]\[=0.32gm\]You need to login to perform this action.
You will be redirected in
3 sec