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Posted by on Friday, December 2, 2011 at 2:32am.

the half-life of a radium is 1690 years is 90 grams is present now, how much will be present in 70 years

  • physics - , Friday, December 2, 2011 at 2:42am

    (90 g)* 2^(-70/1690)
    = 90g * 0.9717 = 87.5 g

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