Question

If 3 grams of a radioactive substance remains after 24 days, how many grams of the substance was there originally? Assume the substance has a half-life of 6 days.

Answer 1

In this question (t½) of isotope is 30 days, which means that after 30 days half of the sample would have decayed and half would be left as it is. After 30 days ( first half life) 120 /2 = 60 g decays and 60 g remains left.

Step-by-step explanation: