Nuclear Equations and Half Life 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

What makes something radioactive?

Back

Unstable nuclei.

Front

What is radioactivity?

Back

The process in which an unstable atomic nucleus emits charged particles & energy.

Front

How much strontium-90 will remain after 100 years if the initial amount is 4.0 g and the half-life is 25 years?

Back

0.25g.

Front

Do gamma rays damage human cells/tissue?

Back

True.

Front

What is the half-life of a substance?

Back

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

Front

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

Back

It decreases exponentially.

Front

If a substance has a half-life of 10 years, how much of a 16g sample will remain after 30 years?

Back

2g.

Front

What type of radiation is emitted during radioactive decay?

Back

Alpha particles, beta particles, and gamma rays.

Front

What is the significance of a radioactive decay series?

Back

It shows the sequence of decay processes that a radioactive isotope undergoes until it reaches a stable form.