If the half-life is 5 minutes, then 30 minutes is equivalent to 6 half-lives. So, after six successive half-lives, the 400 mg of the radioisotope would have a mass of 400(0.5)⁶ = 6.25 mg.
Thus, A would be the correct answer choice here.
It's usually made of tough steel
Giving up consumption today for consumption tomorrow accelerates economic growth by <span>having the economy produce no consumer goods and increasing saving.</span>
It’s snail in a Greek word
