A) 5.02 days
B) 15.2 days
C) 7.6 days
D) 11.4 days
Correct Answer: C
Solution :
Given: half-life of radon is 3.8 days remained radon is \[1-\frac{3}{4}=\frac{1}{4}\] \[\frac{1}{4}={{\left( \frac{1}{2} \right)}^{2}}={{\left( \frac{1}{2} \right)}^{n}},\] so, \[n=2\] = half life \[\times \] days = 2 \[\times \] 3.8 = 7.6 days
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