Radioactive Particles & Half Life

Which of these symbols can be used to represent alpha decay?

• 
• 
• 
• 

What is the structure of an alpha particle?

• a fast-moving electron

• an electromagnetic wave

• a fast-moving positron

• 2 protons and 2 neutrons

In a beta decay...

• a proton changes to a neutron and an electron.

• a proton changes to a neutron and a positron.

• a neutron changes to a proton and an electron.

• a neutron changes to a proton and a positron.

Which type of nuclear radiation is being emitted here?

• Alpha
• beta
• gamma 
• none

In Alpha decay what particle is emitted?

• Helium (He)

• Electron (e^-)

• Energy (Photon)

In Beta decay what particle is emitted?

• Helium (He)

• Electron (e^-)

• Energy (Photon)

What is the most dangerous form of radioactive decay?

• Alpha

• Beta

• Gamma

Which form of radiation can be stopped by something as thin as a sheet of paper?

• Alpha

• Beta

• Gamma

What makes something radioactive?

• elements with an atomic number above 81
• an unstable nucleus
• contaminated sewage
• It decays over time

_______________ is the process by which unstable atoms emit radiation until they become stable.

• Radiation
• Chemical Reaction
• Radioactive Decay
• Isotopes