Plutonium decays with half life of 24000 years. If plutonium is stored for 72000 years, the fraction of it that remains is

Options

A. `1//8`
B. `1//3`
C. `1//4`
D. `1//2`

Answer

A

Explanation

`n=(72000)/(24000)=3`
`(N)/(N_(0))=((1)/(2))^(n)=((1)/(2))^(3)=(1)/(8)`