Asked by Shellie

Radium-221 has a half-life of 30 s. How long will it take for 95% of a sample to decay

16 years ago

Answered by MathMate

Time required = 30 seconds * log(0.05)/log(0.5)
= 129.7 seconds

16 years ago

Answered by Shellie

Thanks...

16 years ago

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