The isotope 208ti undergoes b decay with a half-life of 3.1 min. how long will it take for 99.0% of a sample of pure 208 ti to decay?

20.9 min time taken forn 99.0% of a sample of pure .

Explanation:

From the given,

half line of = 3.1 min

The ratio of the initial amount and amount in time is calculated as follows.

Now 99% got delayed, the left amount will be 1%.

Therefore, 20.9 min time taken forn 99.0% of a sample of pure .