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IIT JEE Advanced 2011 Paper 1

Section: Physics
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Question : 22 of 69
 
Marks: +1, -0
The activity of a freshly prepared radioactive sample is 1010 disintegrations per second, whose mean life is 109 s. The mass of an atom of this radioisotope is 10−25 kg. The mass (in mg) of the radioactive sample is ______.
[JEE Adv 2011 P1]
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