Half Life - Radioactivity

Front

What is Half-Life in the context of radioactivity?

Back

Half-Life is the time required for half of the radioactive atoms in a sample to decay into daughter isotopes.

Front

What are Parent Isotopes?

Back

Parent Isotopes are unstable radioactive atoms that decay into daughter isotopes.

Front

What are Daughter Isotopes?

Back

Daughter Isotopes are the stable or unstable atoms that result from the decay of parent isotopes.

Front

How many half-lives have occurred if 8 out of 32 atoms are parent isotopes?

Back

2 half-lives have occurred.

Front

What percentage of the parent isotope remains after 1 half-life?

Back

50% of the parent isotope remains after 1 half-life.

Front

What percentage of the parent isotope remains after 2 half-lives?

Back

25% of the parent isotope remains after 2 half-lives.

Front

What percentage of the parent isotope remains after 3 half-lives?

Back

12.5% of the parent isotope remains after 3 half-lives.

Front

If no daughter isotopes are present, how many half-lives have occurred?

Back

0 half-lives have occurred.

Front

What is the significance of the half-life in radioactive dating?

Back

The half-life helps determine the age of an object by measuring the remaining amount of parent isotopes.

Front

What happens to the number of parent isotopes over successive half-lives?

Back

The number of parent isotopes decreases by half with each half-life.