Half life practice problems

Front

What is Half-life?

Back

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

Front

When nuclei decay, massive amounts of __________ is released.

Back

energy

Front

Nuclear fission is when scientists put atoms together. True or False?

Back

False

Front

What makes an element radioactive?

Back

When its nuclei decay.

Front

Barium-122 has a half-life of 2 minutes. If it takes 10 minutes to set up an experiment, how much barium-122 will be left from an 80 g sample?

Back

2.5g

Front

What happens to the amount of a radioactive substance over time?

Back

It decreases as the nuclei decay.

Front

What is released during nuclear decay?

Back

Energy.

Front

If a substance has a half-life of 5 years, how much of a 100 g sample will remain after 10 years?

Back

25 g.

Front

True or False: Half-life is the time it takes for all the nuclei in a sample to decay.

Back

False.

Front

What is the half-life of a substance?

Back

The time it takes for half of the radioactive nuclei in a sample to decay.