Radioactivity

Nuclear power plants rely on which of the following reactions to generate energy?

• Fusion

• Half-life

• Fission

• Fusion or fission

Where does fusion occur naturally?

• Underwater

• All around us

• In the radioactive waste

• On the sun

This is an example of...

• Fission  reaction

• Fusion reaction

• Decomposition reaction

• Combustion

Which of the following best describes the process of nuclear fission? 

• Splitting an atom's nucleus apart 

• Separating an atom's electrons from its nucleus 

• Fusing two atomic nuclei together 

• Splitting an atom's electrons in half 

Nuclear power uses ____ for fuel.

• steel

• coal

• uranium

• hydrogen

The time needed for half of a radioactive sample to decay is called its __________.

• decay period

• period

• transmutation time

• half-life

Neutrons released in a fission reaction can strike other nuclei and cause a 

• meltdown

• take down

• break down

• chain reaction

The three types of nuclear radiation in order of decreasing penetrating power are

• alpha, beta, gamma

• alpha, gamma, beta

• beta, alpha, gamma

• gamma, alpha, beta

What makes something radioactive?

• elements with an atomic number above 81

• an unstable nucleus

• contaminated sewage

• It decays over time

If the half life of a radioactive element is 100yrs, how long would it take for the radioactivity to reduce by one half?

• 200yrs

• 100yrs

• 50yrs

• 300yrs