The half-life of a radiactive material is 4 days. Find the time required for `1//4` th of the initial number of radioactive nuclei of the element to remain undisintegrated.

Explanation

For, `t=nT, N=N_(0)//2^(n)`. In this case, n=2.
`therefore t=2T =2 xx 4` days
= 8 days is the required time.