A Geiger counter placed above a radioactive sample register’s 678 counts per minute. How many counts per minute will it register after five half lives have passed
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a
135.6
b
67.8
c
21.18
d
42.40
answer is C.
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Detailed Solution
Given that No = 678 counts/min No of half lifes n=5 Decay Law, NNo=12n ⇒N=No2n=67825=67832=21.18 cpm