Halflife
posted by Andrea .
After two hours, 1/16 of the initial amount of a radioactive isotope remains undecayed. What is the halflife of the isotope?

Halflife 
bobpursley
one half =1/2 left
two half=1/4
three half=1/8
four half=1/15
one halflive=1/4 * 2hours=30 min
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