the time it will take a certain radioactive material with a half-life of 50 days to reduce to 1/32 of its original number is?

A. 250days
B. 150days
C. 300days
D. 200days

Correct Answer:

Option A – 250days

Explanation

Since 1/32, is the fraction left of any radioactive material after 5half lives, that is:
1/32= (1/2)5. Thus if a half-life is 50 days, 5 half-lives will be 50 x 5= 250 days