Question

An element decays by 50% every hour (in other words, it

has an hour half-life). If you have 48 grams of the element,
then how many grams will there be in 5 hours?

Answer 1

1.5 grams

Explanation:

This is because if there are five hours there will be 5 half lives due to it decaying 50% every hour. Therefore we would have to dived 48 by 2, 5 times or in other words 48÷
`2^(5)` = 1.5