1.

Two radioactive elements X and Y have decay constantsλ and 10λ respectively. If decay begins with the same number of atoms of them, the ratio of atoms of X to those of Y after time 19λ will be

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Two radioactive elements X and Y have decay constantsλ and 10λ respectively. If decay begins with the same number of atoms of them, the ratio of atoms of X to those of Y after time 19λ will be





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