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

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >