The video tutorial explains the discovery of radioactivity, starting with uranium's effect on photographic paper. It introduces the three types of radiation: alpha, beta, and gamma. Alpha radiation is easily stopped by air or paper and is heavily charged. Beta radiation is more penetrating, stopped by aluminum, and has a negative charge. Gamma radiation is the most penetrating, being a wave with no charge or mass, and is stopped by lead.

What was the initial evidence that led to the discovery of radioactivity?

• The heat generated by radium rocks

• The emission of sound from uranium

• The effect of uranium rocks on photographic paper

• The color change in radium rocks

Which type of radiation is easily stopped by a piece of paper?

• Gamma radiation

• Alpha radiation

• Beta radiation

• Neutron radiation

How does alpha radiation behave in a magnetic field?

• It is unaffected

• It bends slightly

• It accelerates

• It bends significantly

What is the charge of beta particles?

• Double positive

• Positive

• Negative

• Neutral

Which type of radiation is a wave and not a particle?

• Delta radiation

• Gamma radiation

• Alpha radiation

• Beta radiation