Questions
The half-life of a radioactive material is four hours. If the initial amount is 400g then after 24 hours it will remain
a
9.37g
b
93.75g
c
46.80g
d
6.25g
detailed solution
Correct option is D
Number of half lives =n=tT12=244=6hr's Decay Law in terms of mass , mm0=12n;m0=400g ⇒m=m0126=40026=40064=6.25gTalk 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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