Formative

Front

What is the half-life of a radioactive substance?

Back

The half-life of a radioactive substance is the time required for half of the substance to decay.

Front

If Selenium-83 has a half-life of 25 minutes, how long will it take for a 20 mg sample to decay to 1.25 mg?

Back

It will take 100 minutes for a 20 mg sample of Selenium-83 to decay to 1.25 mg.

Front

What type of decay is characterized by the emission of helium nuclei?

Back

Alpha decay is characterized by the emission of helium nuclei.

Front

What are beta particles?

Back

Beta particles are negatively charged particles emitted from a nucleus at high speed during beta decay.

Front

What is an alpha particle?

Back

An alpha particle is a helium nucleus consisting of two protons and two neutrons.

Front

What type of nuclear radiation is emitted during beta decay?

Back

Beta radiation is emitted during beta decay.

Front

How does alpha decay differ from beta decay?

Back

Alpha decay involves the emission of alpha particles (helium nuclei), while beta decay involves the emission of beta particles (electrons or positrons).

Front

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

Back

Half-life is significant because it helps predict how long it will take for a radioactive substance to decay to a certain amount.

Front

What happens to the mass of a radioactive substance during decay?

Back

The mass of a radioactive substance decreases as it decays, as some of the mass is converted into energy.

Front

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

Back

The remaining quantity can be calculated using the formula: Remaining Quantity = Initial Quantity * (1/2)^(number of half-lives).