An alpha active element has molar mass M...

An alpha active element has molar mass M and has a half life of `tau`. A large plate of thickness `alpha` is made from the radioactive element. Density of the plate is `rho`. Calculate the number of alpha particles emitted in unit time from unit surface area of the plate. Avogadro’s number is `N_(A)`.

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The correct Answer is:

`(ln^(2)2)/(2)(alpharhoN_(A))/(tauM)`

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