Radioactivity Quiz

What is the symbol for the decay constant?

• N

• A

• λ

• T

What is the time constant for exponential decay in radioactivity?

• 24 hours

• 48 hours

• 12 hours

• 37% of the original value

What is the activity of a sample proportional to?

• Volume of the sample

• Number of neutrons

• Mass of the sample

• Number of nuclei

What is the area of a sphere used to calculate the activity of a source with a Geiger counter?

• 4πR^2

• 3πR^2

• πR^2

• 2πR

What is the intensity of radiation inversely proportional to?

• The distance from the source

• The square root of the distance from the source

• The square of the distance from the source

• The cube of the distance from the source

What is the symbol for the activity of an isotope?

• λ

• N

• A

• T

What is the time taken for the activity of an isotope to halve called?

• Time interval

• Decay constant

• Half-life

• Time constant

What is the unit of the decay constant?

• m

• s^-1

• s

• m^-1

What is the measure of radioactivity in counts per second called?

• Becquerel

• Tesla

• Joule

• Watt

How does the half-life of a radioactive isotope affect its decay rate?

• The longer the half-life, the slower the decay rate

• The shorter the half-life, the slower the decay rate

• The half-life has no effect on the decay rate

• The decay rate is constant regardless of the half-life