###### Asked in Needs a Topic

Needs a Topic

# What is the half-life of a 0.02-g sample of radioisotope that decayed to 0.01 g in 31 s?

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### What are the enemys on Legend of Zelda Skywards Sword?

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###### Asked in Physics

### If the half-life of a radioactive element is 4 days how long will it take for three fourths of a sample of the element to decay?

The half-life is 4 days. That means half of it will be gone in 4
days, and that leaves half of the original sample. In another 4
days, half of the remaining half will have decayed. And that will
leave only 1/4 th of the original sample. That means 3/4 ths of the
original sample will have decayed. In 8 days, three fourths
of a sample of a radioactive element with a half-life of 4 days
will have decayed.

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