Answer:
3 DAYS
Step-by-step 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.