Radioactive Decay and Activity Quiz

What is the unit of measurement for activity in radioactive decay?

• Curie

• Becquerel

• Gray

• Rutherford

Which factor is directly proportional to the activity of a radioactive sample?

• Pressure

• Temperature

• Half-life

• Amount of substance

How does the half-life of a substance affect its activity?

• Inversely proportional

• No effect

• Exponentially proportional

• Directly proportional

What is the decay constant symbolized by in the equations for activity?

• Gamma

• Beta

• Alpha

• Lambda

How is the decay constant calculated?

• Natural log of 2 divided by the half-life

• Half-life divided by natural log of 2

• Natural log of 2 multiplied by the half-life

• Half-life multiplied by natural log of 2

Which equation is used to calculate the activity at a later time based on the original activity?

• A = A0 * e^(-λt)

• A = λ * N

• A = N / t

• A = A0 / (1 + λt)

What does the exponential decay curve represent in a graph of activity?

• Random fluctuations in activity

• Linear increase in activity

• Constant activity over time

• Decrease in activity over time

How can the half-life of a sample be determined from a graph of activity?

• By finding the peak of the curve

• By finding the time at which activity halves

• By finding the time at which activity doubles

• By finding the area under the curve

What happens to the activity of a sample as it decays over time?

• It fluctuates randomly

• It decreases

• It remains constant

• It increases

What is the relationship between the number of radioactive nuclei and activity?

• Exponentially proportional

• No relationship

• Directly proportional

• Inversely proportional