A radioactive isotope having `t_(1/.2)=2.3` days was received after 9.2 days . It was found that 300 mg of the isotope was left in the container. The initial amount of the isotope was

Options

A. 4800 mg
B. 2400 mg
C. 1200 mg
D. 3600 mg

Answer

A

Explanation

No. of half lives , `n=(t)/(t_(1//2))`
`n=(9.2)/(2.3)=4`
`therefore N_(0)=2^(n)*N`
`=2^(4)xx300 mg =4800` mg