Front

What is Radioactive Decay?

Back

Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting radiation, resulting in the transformation of the nucleus into a different element or isotope.

Front

What is Half-life?

Back

The half-life is the amount of time it takes for half the nuclei in a sample of a radioactive isotope to decay.

Front

What is the Half-life of Iodine-131?

Back

The half-life of Iodine-131 is 8 days.

Front

What is the Half-life of Strontium-90?

Back

The half-life of Strontium-90 is 25 years.

Front

How much of a substance remains after 2 half-lives?

Back

After 2 half-lives, 25% of the original amount of the substance remains.

Front

If the half-life of a substance is 10 seconds, how much will remain after 30 seconds?

Back

After 30 seconds, which is 3 half-lives, 12.5% of the original amount will remain.

Front

What is emitted during radioactive decay?

Back

During radioactive decay, massive amounts of energy are released.

Front

What happens to the mass of a radioactive isotope over time?

Back

The mass of a radioactive isotope decreases over time as it decays into other elements or isotopes.

Front

What is a radioactive isotope?

Back

A radioactive isotope is an isotope of an element that has an unstable nucleus and can undergo radioactive decay.

Front

What is the formula to calculate remaining mass after a certain number of half-lives?

Back

Remaining mass = Initial mass × (1/2)^(number of half-lives).