Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Units (Radioactivity)
18 practice questions
Practice questions
1–8 of 8 · Normal
Question 1
1 mark · Normal
Answer and see the solution →State the unit of activity for a radioactive source.
Question 2
1 mark · Normal
Answer and see the solution →Which unit would be used to measure the thickness of a sheet of material when investigating the penetration power of different types of radiation?
Question 3
1 mark · Normal
Answer and check →A Geiger-Müller tube records 90 decays in 3 minutes. Which option correctly expresses this quantity as an activity in SI units?
- A.30 Bq
- B.90 Bq
- C.270 Bq
- D.3 Bq
Question 4
2 marks · Normal
Answer and see the solution →A radioactive source emits 150 decays in 2.5 minutes. Calculate its activity in Bq.
Question 5
1 mark · Normal
Answer and see the solution →State the unit used for measuring time when recording radioactive decay in practical investigations.
Question 6
3 marks · Normal
Answer and see the solution →A class is measuring background radiation. The table shows the counts measured in each of three 60-second intervals:
Background radiation counts Interval Counts 1 12 2 14 3 10 (a)[1 mark]Calculate the average count per interval.
(b)[2 marks]Calculate the average activity in Bq (counts per second).
Question 7
2 marks · Normal
Answer and see the solution →Describe how you would measure the activity of a radioactive source in the laboratory, naming all units used.
Question 8
1 mark · Normal
Answer and check →Which of the following combinations is correct for measuring the rate at which a radioactive sample decays?
- A.Counts per second (Bq)
- B.Centimetres per minute (cm/min)
- C.Seconds per decay (s)
- D.Counts per centimetre (Bq/cm)