What is the half life of a radioisotope if you started with 1 gram and 0.250 grams is left over after 6 days?

3 DAYS

Explanation:

Half-life is the time required for a quantity of a radioisotope to reduce to half its initial value. It is represented as t1/2

In the question given,

t1/2 = 3 days

Since 1 gram of the radioisotope divides to half and give 0.5 grams = t1/2

Subsequently division yields;

1gram = 0.5 gram in 3 days

0.5 gram = 0.250 grams = 3 days

This is so because after 6 days, 0.250 gram of the radioisotope is remaining.

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