The acitivity of a certain sample of raidoactive element 'A' decreases to `1 sqrt(2)` of its value in 4 days. What is its life? Assuming that,
`._(Z)^(M)A - ._(2)^(4)He to ._(Z - 2)^(M - 4)B`
What mass of the sample will be left over after 24 days if we start with one gram of 'A' ? calaculate this in terms of M.

Explanation

`lambda = (2.303)/(t) log_(10) ((N_(0))/(N))`
`(0.693)/(t_(1//2)) = (2.303)/(4) log_(10) (sqrt(2)) :' N = (N_(0))/(sqrt(2))`
`t_(1//2) = 6` days
Use `N = N_(0) ((1)/(2))^(n)` for next part.