# The half-life of an isotope of tritium is 4500 days. How many days will it take an amount of tritium to fall to a quarter of its initial mass?

##
year 9 question

year 9 question

##### 1 Answer

9000 days.

#### Explanation:

Decay can be described by the following equation:

So

1 half-life is 4500 days, so it must take