Nuclear Physics and Space Physics

What is radioactive decay?

• Radioactive decay is the process of chemical reactions in stable elements.

• Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting radiation.

• Radioactive decay is the process of a stable atomic nucleus gaining energy.

• Radioactive decay is the process by which atoms combine to form new elements.

Name the three main types of radioactive emissions.

• Delta particles

• Alpha particles, Beta particles, Gamma rays

• Alpha particles, Beta particles, Gamma particles

• Theta rays

How is half-life defined in the context of radioactivity?

• The duration required for the entire sample to lose its radioactivity.

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

• The period during which all radioactive isotopes in a sample decay.

• The time it takes for a radioactive sample to become completely stable.

Calculate the remaining amount of a 100g sample after 3 half-lives if the half-life is 2 years.

• 50g

• 12.5g

• 75g

• 25g

What instrument is commonly used to detect radiation?

• Thermometer

• Geiger-Müller counter

• Barometer

• Anemometer

Describe one method of detecting alpha particles.

• Using a mass spectrometer.

• Using a scintillation detector.

• Using a thermal imaging camera.

• Using a Geiger-Müller counter.

What are the safety precautions to take when working with radioactive materials?

• Use water as a shield.

• Stand directly next to the radioactive source.

• 1. Use shielding (lead, concrete). 2. Maintain distance from the source. 3. Wear personal protective equipment (PPE). 4. Follow proper disposal procedures. 5. Monitor radiation levels regularly. 6. Ensure proper ventilation.

• Dispose of materials in regular trash.

Explain the concept of the nucleus in an atom.

• The nucleus is the dense central core of an atom, made up of protons and neutrons.

• The nucleus is the outer shell of an atom, containing electrons.

• The nucleus is a fluid that fills the space around the atom.

• The nucleus is a type of chemical bond between atoms.

What is the primary component of the Earth's atmosphere?

• Argon

• Carbon Dioxide

• Oxygen

• Nitrogen

List the planets in our solar system in order from the sun.

• Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

• Earth, Mars, Venus, Mercury, Jupiter, Saturn, Uranus, Neptune

• Venus, Earth, Mars, Jupiter, Saturn, Neptune, Uranus, Mercury

• Mercury, Venus, Earth, Mars, Jupiter, Saturn, Pluto