What should be the activity of a radio active sample of mass ‘m’ and decay constant λ, after time t ? (Take molecular mass of sample be M and Avogardro’s number be Na).
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a
A=MNaλte−λt
b
A=mNaλMe−λt
c
A=mNaλte−λt
d
A=MmλNae−λt
answer is B.
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Detailed Solution
Let the initial number of nuclei be N0 .∴ N0=mNaMActivity A=A0e−λt= λNoe−λt=mNaλMe−λt.