A) 7070
B) 9000
C) 8000
D) 7500
Correct Answer: A
Solution :
We know, \[\frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{t/T}}\] \[\Rightarrow \] \[\frac{N}{100000}={{\left( \frac{1}{2} \right)}^{10/20}}\] \[\Rightarrow \] \[N=\frac{10000}{\sqrt{2}}=\frac{10000}{1.414}=\frac{10000}{1.414}=7070\]You need to login to perform this action.
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