Questions
The percentage of quantity of a radioactive material that remains after 4 half lives will be
a
3.125
b
6.25
c
12.5
d
25
detailed solution
Correct option is B
Given : t=4T1/2 No of half lives=n=tT1/2=4 Decay Law, NNo=12n=124=116 ⇒NNo×100=116×100=10016=6.25%Talk 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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