Materials
For this paper you must have:
• a ruler
• a scientific calculator
• the Physics Equations Sheet (enclosed).
Instructions
• Use
... [Show More] black ink or black ball-point pen.
• Pencil should only be used for drawing.
• Fill in the boxes at the top of this page.
• Answer all questions in the spaces provided.
• If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s).
• Do all rough work in this book. Cross through any work you do not want to be
marked.
• In all calculations, show clearly how you work out your answer.
For Examiner’s Use
Question Mark
1
2
3
4
5
6
TOTAL
Information
• The maximum mark for this paper is 70.
• The marks for questions are shown in brackets.
• You are expected to use a calculator where appropriate.
• You are reminded of the need for good English and clear presentation in your answers.
*JUN238464P1F01*
IB/M/Jun23/E7 8464/P/1F
2
0 1A scientist investigated the radiation emitted by different radioactive isotopes. The
scientist had a sample of polonium-210.
The radiation emitted by polonium-210 can be represented by the symbol 2
4
He.
0 1 . 1 Which type of radiation can be represented by the symbol 2
4
He?
[1 mark]
Tick (
✓
) one box.
Alpha
Beta
Gamma
How many protons are there in a particle of radiation represented by 4
0 1 . 2 2 He?
Tick (
✓
) one box.
[1 mark]
2 4 6 8
0 1 . 3 A polonium-210 (Po) nucleus changes into a lead (Pb) nucleus by emitting a 4
2 He
particle. This is shown by the following nuclear equation.
21084Po →
206XPb + 4
2He
What is the value of X?
[1 mark]
Tick (
✓
) one box.
80 82 84 86
Do not write
outside the
box
*02*
IB/M/Jun23/8464/P/1F
3
0 1 . 4The sample of polonium-210 had an activity of 100 Bq.
Complete the sentence.
Choose the answer from the box.
[1 mark]
25 50 100 200
After one half-life, the activity of polonium-210 in the sample
was Bq.
Question 1 continues on the next page
Do not write
outside the
box
Turn over ►
*03*
IB/M/Jun23/8464/P/1F
4
The scientist investigated another radioactive isotope that is a source
of gamma radiation.
Figure 1 shows the equipment used.
Figure 1
0 1 . 5 The count-rate is the number of counts detected each second.
In 30 seconds the number of counts detected was 1500.
Calculate the count-rate.
[2 marks]
Count-rate = counts per second
Do not write
outside the
box
*04*
IB/M/Jun23/8464/P/1F
5
The scientist placed a thick sheet of lead between the source of gamma radiation and
the detector.
0 1 . 6 What was the effect of the sheet of lead on the count-rate?
Give a reason for your answer.
[2 marks]
Effect
Reason
0 1 . 7 The lead was irradiated by the gamma radiation.
What happened to the lead when it was irradiated by the gamma radiation?
[1 mark]
Tick (
✓
) one box.
The lead atoms became radioactive.
The lead gained atoms from the radioactive source.
The lead was exposed to gamma radiation.
Question 1 continues on the next pag [Show Less]