radioactivity and half-life

Front

What is Radioactive Decay?

Back

Radioactive Decay is the process by which unstable atoms emit radiation until they become stable.

Front

What is Half-life?

Back

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

Front

If the half-life of an isotope is 2.4 minutes, how much of a 100g sample remains after 7.2 minutes?

Back

12.5g

Front

After how many half-lives is 1/8 of a sample remaining?

Back

After 3 half-lives.

Front

Where is radioactivity applied in our lives?

Back

Radioactivity has applications in Medicine, Energy (electricity), and Agriculture.

Front

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

Back

The mass decreases as the substance decays into more stable forms.

Front

What is an isotope?

Back

An isotope is a variant of a chemical element that has the same number of protons but a different number of neutrons.

Front

What is the significance of the half-life in radioactivity?

Back

The half-life helps determine how long it takes for a radioactive substance to decay to a certain level.

Front

How do you calculate the remaining amount of a radioactive substance?

Back

Use the formula: Remaining amount = Initial amount × (1/2)^(time elapsed / half-life).

Front

What type of radiation can be emitted during radioactive decay?

Back

Alpha particles, beta particles, and gamma rays.