First slide

Radio activity

Question

Half-life of a radioactive element is 10 days. The time during which quantity remains 1/10 of initial mass will be

Moderate

A

100 days
B

50 days
C

33 days
D

16 days

Solution

After three half-lives (i.e., 30 days) it remains ${(\frac{1}{2})}^{3} = \frac{1}{8}$ , so it will remain $\frac{1}{10} th$ , approximately in 33 days.

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