Question

Select One Option Correct from the following : A freshly prepared radioactive source of half-life 2 h emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is
(A) 6 h
(B) 12 h
(C) 24 h
(D) 128 h

Answer 1

your answer is 12 h.mark this as a brainlist answer.