Radioactive Half-Life

The video tutorial explains how radioactivity can make substances more stable through a process called radioactive decay, where unstable isotopes emit radiation to become stable elements. It uses Molybdenum 99 as an example, which decays into Technetium and then into stable Ruthenium 99. The concept of half-life is introduced as a measure of the time it takes for a substance's radioactivity to decrease by half, highlighting its importance in determining when a radioactive substance becomes safe. The variability of half-lives across different materials is also discussed, emphasizing the need for safe storage of radioactive waste.

What is the process called when an unstable isotope emits radiation to become stable?

• Isotope stabilization

• Nuclear fusion

• Radioactive decay

• Chemical reaction

Which element does Molybdenum 99 become after emitting beta radiation?

• Technetium

• Ruthenium

• Plutonium

• Uranium

What type of radiation does Technetium emit to become Ruthenium 99?

• Alpha and beta radiation

• Gamma and beta radiation

• Neutron radiation

• Only gamma radiation

How do scientists determine when a radioactive substance is no longer dangerous?

• By testing its chemical composition

• By observing its color change

• By calculating its half-life

• By measuring its temperature

What happens to the amount of a radioactive substance after one half-life?

• It becomes completely stable

• It decreases by half

• It remains the same

• It doubles