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Q.

The half-life of a radioactive material is four hours. If the initial amount is 400g then after 24 hours it will remain

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a

9.37g

b

93.75g

c

46.80g

d

6.25g

answer is D.

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Detailed Solution

Number of half lives =n=tT12=244=6hr's Decay Law in terms of mass , mm0=12n;m0=400g ⇒m=m0126=40026=40064=6.25g
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The half-life of a radioactive material is four hours. If the initial amount is 400g then after 24 hours it will remain