Question #076dd

1 Answer
EET-AP
May 21, 2017

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

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