JEE(Main)-Physics 20 The activity of a f...

JEE(Main)-Physics 20 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 (1) 1 mg (2) 2 mg (3) 4 mg (4) 5 mg (JEE 2011]

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JEE(Main)-Physics 20 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 (1) 1 mg (2) 2 mg (3) 4 mg (4) 5 mg (JEE 2011]

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