1.

A sample contains 0.1 gram-atom of radioactive isotope ._(Z)^(A)(t_(1//2)=5 days) How many number of atoms will decay during eleventh day? [N_(A)= Avogradro's number]

Answer»

`0.1(-E^(-(0.693 xx 11)/(5))+e^(-(0.693 xx10)/(5)))`
`0.1(-e^((0.693 xx 11)/(5))+e^((0.693 xx10)/(5)))`
`0.1(-e^((-0.693 xx 11)/(5))+e^(-(0.693 xx10)/(5)))N_(A)`
`0.1(-e^((0.693 xx 11)/(5))+e^((0.693 xx10)/(5)))N_(A)`

Answer :c


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