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. 1/8th of it will remain intact at the end of four months

B. It will completely disintegrate in two months

C. It will completely disintegrate in four months

D. 3/4th of it will disintegrate in two months

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