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Half-life of a substance is 10 years. In...

Half-life of a substance is `10` years. In what time, it becomes `(1)/(4) th` part of the initial amount ?

A

15 yr

B

20 yr

C

25 yr

D

30 yr

Text Solution

Verified by Experts

The correct Answer is:
B
We know that, `N=N_(0)e""^((-t)/(T_(1//2)`
`(1)/(4)=e^(-t//10)implies((1)/(2))^(2)impliest=20yr`
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