A) 460 days
B) 560 days
C) 140 days
D) 70 days
Correct Answer: B
Solution :
Here half-life of polonium =140 days Remained amount\[=1-\frac{15}{16}=\frac{1}{16}\] Here \[{{\left( \frac{1}{16} \right)}^{n}}={{\left( \frac{1}{2} \right)}^{n}}\] So, \[n=4\] Hence, element will decay in \[=4\times 140=560\text{ }days\]
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