Posted by **Rachel** on Saturday, May 18, 2013 at 4:06am.

An unknown radioactive element decays into non-radioactive substances. In 100 days the radioactivity of a sample decreases by 64 percent.

a)(a) What is the half-life of the element? half-life:

b)How long will it take for a sample of 100 mg to decay to 51 mg?

time needed:

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