Chemistry

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18 November, 12:43

Radioactivity is caused by the decay of the nucleus which occurs when unstable

nuclei lose protons and neutrons. This quiz will look at the time it takes for a specific

amount of radioactive material to decay, which is measured in a unit called half-life.

If you are given the half-life for the decay of a particular radioisotope, then you can

calculate how much of that radioisotope remains after several half-lives:

fraction remaining (FR) = 1/27

where n=number of half-lives

Knowing this, what is the fraction equivalent of 2 half-lives? (Your answer should be

a fraction, no units necessary