Best Answer

One eighth remains.

User Avatar

Wiki User

5y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: What fraction of an original sample of a radio isotope remains after 3 half-life periods?
Write your answer...
Still have questions?
magnify glass
Related questions

What does a half life fraction look like?

A half-life fraction is typically represented as a decimal or a percentage that indicates the fraction of a substance that remains after a certain amount of time has passed. For example, if a substance has a half-life of 2 hours and after 2 hours, only half of the original amount remains, the half-life fraction would be 0.5 or 50%.

How does simple interest work?

Multiply together the capital, the interest rate (as a fraction) and the number of periods to find out the interest.

Why is a uranium isotope often used rather than 14C in radiometric dating to determine the age of earth?

The isotope carbon 14 is used only for organic materials (or objects contaminated with organic materials); also carbon 14 dating is applicable only to short periods of time.

How long did a basketball game last under original rules?

three 20-min. periods

How long did a college basketball game last under the original rules?

two 20 min. periods

How do you know whether a maths question is asking you to work out compound or simple interest?

For the second (and subsequent) periods, if the interest is to be calculated for the original sum PLUS the interest earned so far then it is compound interest. If only the original amount earns interest in all periods then it is simple interest.

What is RU87?

Usually refers to the chemical element rubidium (Rb), frequently confused with the Ruthenium (Ru), which is an element used for dating long periods of time, because the 87 rubidium isotope, transforms into Strontium 87

What is 5.4 in a fraction?

If by "54" you mean ".54", then that decimal converted to a fraction is 54/100, which can be simplified to 27/50.If by "54" you mean ".54545454... etc" (repeating), that decimal converted to a fraction is 6/11.(WikiAnswers really needs to allow periods in their questions, it's not your fault.)

What fraction of a radioactive sample remains after one half-life?

Half of the original sample of a radio isotope remains after a half-life period. After two half-life periods, one-fourth of the radio isotope remains.

What unique attributes does the Original Nursing Bra offer nursing mothers?

The Original Nursing Bra offers many unique attributes. It is a cotton nursing bra that can adapt to a mother's changing shape during her nursing periods.

What are patterns or models that repeatedly appear in literature across cultures and time periods called?

While the choices offered in the original question are not shown, the general term for patterns or models that repeatedly appear in literature across cultures and time periods are called archetypes.

Are there any limits to carbon dating?

Yes:it cannot date things older than ~40,000 years as the carbon-14 isotope has decayed to practically undetectable levels after that much timeas levels of the carbon-14 isotope in the atmosphere vary slightly over time (it is produced by the flux of cosmic rays hitting earth, which varies as the solar system orbits the galaxy, etc.) the dating method must be recalibrated using tree ring count reference samples to keep it accurate over long periods of timeof course it can only be used to date things that were once living, and thus in equilibrium with atmospheric carbon isotope ratios at the time of deathoceanic carbon isotope ratios are different from atmospheric carbon isotope ratios, so this must be accounted for in dating sea creature fossils