Asked by Massiel

If in August 1911 Mme. Curie prepared an international standard containing
20.00 mg of RaCl2, what will the radium content of this standard be in August 2010?

Answers

Answered by bobpursley
Halflife of radium 222 is 1601 years.

content=20mg*e^(-ln2*t/1601) and t= 99 years

content= 20.00 e^(-4.286E-2)=1.168 check that.
Answered by Massiel
Thanks!
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