The time taken for a radioactive element to reduce to 50% of its original
weight is __________ years, if its half life period is 12 years.
(A) 24
(B) 18
(C) 6
(D) 36
weight is __________ years, if its half life period is 12 years.
(A) 24
(B) 18
(C) 6
(D) 36