A) 15 days
B) 7.5 days
C) 30 days
D) 60 days
Correct Answer: C
Solution :
Ratio of left mass to original\[=\frac{1}{16}{{\left( \frac{1}{2} \right)}^{4}}\] i.e., \[16\,\,g\] of substance has reduced to \[1\,\,g\] after 4 half-lives. \[\therefore \]half-life of substance\[=\frac{120}{4}=30\]days
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