Questions
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
detailed solution
Correct option is C
Given that No = 678 counts/min No of half lifes n=5 Decay Law, NNo=12n ⇒N=No2n=67825=67832=21.18 cpmTalk to our academic expert!
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In a radioactive material, fraction of active material remaining after time t is 9/16. The fraction that was remaining after t/2 is :
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