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  3. the mean lives of a radioactive substance are 1620

The mean lives of a radioactive substance are 1620 years and 405 years for a...

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The mean lives of a radioactive substance are 1620 years and 405 years for a emission and emission respectively The time during which three fourth of a sample will decay if it is decaying both by a emission and B emission simultaneously is a 339 years c 559 years b 449 years d 669 years

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