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21 Compute the activity of one gram of decay constant is 1 58 x 10...

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21 Compute the activity of one gram of decay constant is 1 58 x 10 18 1 number 6 02 x 1023 mole Hint R luc whose Take Avogadro s dN dt 3 7 x 104 disintegrations s N Ans 0 11 uc microcurie 22 The half life of a radioactive material is 40 days What time will it take for the activity to drop to 30 of its initial value loge 2 0 6931 and loge 10 3 1 20 R N Ans 69 2 days

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