A pure radio-chemical preparation was observed to disintegrate at the rate of 2140 counts/minutes at 12.35 P.M. of the same day,

A pure radio-chemical preparation was observed to disintegrate at the rate of 2140 counts/minutes at 12.35 P.M. of the same day, the disintegration rate of the sample was only 535 count/minutes. What is the half-life of the material?
A. 50 min
B. 100 min
C. 200 min
D. None of these

A pure radio-chemical preparation was observed to disintegrate at the rate of 2140 counts/minutes at 12.35 P.M. of the same day, the disintegration ra

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