Radiation and Nuclear Reactions Concepts

Ms. Crystal Foley introduces nuclear radiation, discussing its discovery by Becquerel and the Curies. She explains nuclear reactions, radioisotopes, and the types of radioactive decay: alpha, beta, and gamma. The properties and behavior of radioactive particles, including their penetrating power and interaction with electromagnetic fields, are covered. The session concludes with a reference to resources.

Who discovered the phenomenon of radioactivity through an accidental experiment?

• Marie Curie

• Pierre Curie

• Antoine Becquerel

• Albert Einstein

What is a key characteristic of nuclear reactions compared to chemical reactions?

• They are affected by temperature changes.

• They require a catalyst to occur.

• They are not influenced by external conditions.

• They can be easily stopped.

What happens to the atomic number and mass number during alpha decay?

• Atomic number decreases by 2, mass number decreases by 4.

• Atomic number decreases by 4, mass number decreases by 2.

• Atomic number increases by 2, mass number increases by 4.

• Atomic number remains the same, mass number decreases by 4.

Which type of decay involves the conversion of a neutron into a proton?

• Delta decay

• Gamma decay

• Beta decay

• Alpha decay

What is emitted during beta decay?

• A neutron

• An electron

• A gamma ray

• A proton

Which type of radiation has the highest penetrating power?

• Gamma rays

• Beta particles

• Neutrons

• Alpha particles

How can gamma rays be partially stopped?

• By a piece of paper

• By a thin sheet of aluminum

• By several meters of concrete

• By a wooden block

What charge does an alpha particle carry?

• Neutral

• Positive

• Variable

• Negative

In an electromagnetic field, which plate do beta particles move towards?

• Positive plate

• They do not move

• Negative plate

• Neutral plate

What is the primary composition of gamma rays?

• Helium nuclei

• Electrons

• Photons of high energy

• Protons