Take this Quiz: A-Level Physics: Radioactive Decay | Zestly

Question 1

An alpha particle and a beta particle enter a uniform magnetic field of 0.5 T moving at the same velocity perpendicular to the field lines. Which statement correctly describes their relative deflection?

Accepted Answer

The alpha particle deflects less because it has a much larger mass.

Question 2

A gamma source has an activity of 400 MBq at a distance of 2.0 m. What is the intensity of the radiation at a distance of 4.0 m from the source, assuming the inverse square law applies?

Accepted Answer

100 MBq equivalent intensity

Question 3

Which of the following statements regarding the properties of ionizing radiation are correct?

Accepted Answer

Alpha particles have the highest ionizing power due to their double positive charge.

Question 4

A radioactive sample has a decay constant $\lambda = 0.05 	ext{ s}^{-1}$. Calculate the time taken for the number of undecayed nuclei to fall to 25% of the initial value $N_0$.

Answer

13.86 s

Answer

20.00 s

Answer

27.72 s

Answer

55.44 s

Question 5

Which of the following practices are standard radiation safety principles when handling radioactive sources in a laboratory?

Answer

Using a magnet to store alpha sources to keep them contained.

Answer

Using long-handled tongs to increase the distance from the source.

Answer

Increasing the time spent near the source to ensure accurate measurements.

Answer

Storing sources in lead-lined containers when not in use.