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A pure radio-chemical preparation was ob...

A pure radio-chemical preparation was observed to disintegrate at the rate of 2140 counts/minutes at 12.35 P.M. At 3.55 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

Text Solution

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The correct Answer is:
B
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