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Q.

Which sample contains greater number of nuclei :a 5.00- μCi sample of 240Pu (half-life 6560y) or a 4.45-μCi sample of 243Am (half-life 7370 y)

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a

240Pu

b

243Am

c

Equal in both

d

None of these

answer is C.

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Detailed Solution

Taking the ratio of this expression for 240Pu  to this same expression for  243Am,i.e. the two samples contains equal number of nuclei.
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