Question

Plutonium decays with half of 24000 years. If plutonium is store for 72000 yrs. The fraction of .its that remain:-

Options

• `1/8`

• `1/3`

• `1/4`

• `1/2`

Answer 1

`1/8`

Explanation:

No of half live `1/T = 72000/24000` = 3

The fraction left = `(1/2)^pi = (1/2)^B = 1/8`