The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then____________?
(A) 3/4th of it will disintegrate in two months
(B) It will completely disintegrate in two months
(C) It will completely disintegrate in four months
(D) 1/8th of it will remain intact at the end of four months
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