Question

# The activity of a radioactive nuclide (X100) is 6.023 curie at a certain time ‘t′. If its disintegration constant is 3.7×104s−1 the mass of X after t sec is:6.022×106g10−15g10−13g10−17g

Solution

## The correct option is B 10−15gAcitivity = λ × N 1C = 3.7 × 1010 Dps threfore 6.203×3.7×1010=3.7×104× N N=6.023×106 Number of moles = 6.023×1066.023×1023 Mass of X after time t= 6.023×1066.023×1023 ×100                     =10−15 g

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