After one half life, the ratio of parent atoms to daughter atoms in a sample is 1:2.

True or False

False

Explanation:

As we know that half life of any substance is constant. The ratio of parent to daughter atoms after one half life will be 1:1, then after the second half life further half of the first half will decay and will produce more daughter and reduce more parent and making the ratio 1:3, the ratio after 3rd half life will be 1:7, then 1:15 and so on.

Let's suppose that we are given with 100 g of radioactive substance and we are calculating the mass of parent and daughter atoms after every half life as;

1/2 life Mass of Parent Mass of Daughter Ratio

0 100 g 0 100:0

1 50 50 1:1

2 25 75 1:3

3 12.5 87.5 1:7

4 6.25 93.75 1:15