Question

The half life of a radioactive substance is 30 days. The time taken to disintegrate the 3/4 of its original mass is

Answer 1

Answer:

half life is 1/2 = 30 days.

1/2^2 = 60 days.

then 1/2 + 1/4 = 30 +60 days.

3/4th = 90 days