1.

A radioactive sample has a half life of 5.0 mins. what fraction of the sample is left after 20 mins.

Answer»

Answer:

The GENERAL formula for this PROBLEM is:

%left = (1/2)^(TIME PAST / half-life)

In this case, %left = (1/2)^(20/5) = 0.5^4 = 0.0625 = 1/16

Consider 18 minutes:

%left = (1/2)^(18/5) = 0.5^3.6 = 0.0825

Explanation:



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