Question

Consider a quantity of a radioactive substance. The fraction of this quantity that remains after t half-lives can be found by using the expression 3-t

Answer 1

Answer:

Since, 3

−t

is the expression used for finding the fraction of the quantity that remains after t half-lives.

Hence, the fraction of substance remains after 7 half-lives will be equal to 3

−7

i.e.

3

7

1

.