The activity of a freshly prepared radio-active sample is 1010 disintegrations per second, whose mean life is 109s. The mass of an atom of this radio-isotope is 10−25 kg. The mass (in mg) of the radioactive sample is
2
3
4
1
A
1
B
2
C
4
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3
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Solution
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dNN=λN Therefore, N=1019 atoms Mass of sample =10−25×1019kg=1mg
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