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OpenStudy (uselesscookies):

The half-life of radium-224 is 3.66 days. What was the original mass of this radioactive isotope if 1.2 mg remains after 10.98 days?

OpenStudy (joannablackwelder):

Here is the radioactive decay formula: A=Aoe-( 0.693t/T1/2 )|dw:1432329587434:dw|

OpenStudy (joannablackwelder):

Half life is when we have half of what we started with, so A/Ao=.5 Can you find k using that info?

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