The half life of a radioactive element is 8-days. How long it take to reduce it from 10 mg to 5 mg...? Mcqs

The half life of a radioactive element is 8-days. How long it take to reduce it from 10 mg to 5 mg...?

(A) 4 days

(B) 12 days

(C) 16 days

(D) 8 days