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4 Increases but mass number remains same 157 Activity of a radioactive substance decays from...

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4 Increases but mass number remains same 157 Activity of a radioactive substance decays from 8000 becquerel to 4000 becquerel in 5 days Activity of the substance after next 10 days will be 1 500 becquerel 2 1500 becquerel 3 2000 becquerel 4 1000 becquerel

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