Question

Question #076dd

Answer 1

`1/8` of the substance will remain undecayed after 30 days.

Explanation:

If the half life of the substance is `10 days`, it means that only half of the original quantity will remain at the end of `10 days`.

So `30 days` is `3xx10 = 3x`(half life) periods.

1) After `10 days` the remaining substance will be `1/2`

2) After `20 days` the remaining substance will be `1/2xx1/2=1/4`

3) After `30 days` the remaining substance will be `1/2xx1/2xx1/2=1/8`