Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
PHYSICS
Paper 3
Section A
Time allowed: The total time for
Materials
both sections of this paper is
For this paper you must have: 2 hours. You are advised to
• a pencil and a ruler spend approximately
• a scientific calculator
• a Data and Formulae Booklet 70 minutes on this section.
• a protractor.
For Examiner’s Use
Instructions
Question Mark
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page. 1
• Answer all questions. 2
• You must answer the questions in the spaces provided. Do not write 3
outside the box around each page or on blank pages.
• If you need extra space for your answer(s), use the lined pages at the end of TOTAL
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.
• Show all your working.
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 45.
• You are expected to use a scientific calculator where appropriate.
• A Data and Formulae Booklet is provided as a loose insert.
*JUN2174083A01*
IB/M/Jun21/E8 7408/3A
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 Figure 1 shows apparatus used to investigate the inverse-square law for gamma
radiation.
Figure 1
*02*
IB/M/Jun21/7408/3A
, 3
Do not write
outside the
A sealed source that emits gamma radiation is held in a socket attached to clamp B. box
The vertical distance between the open end of the source and the bench is 138 mm.
A radiation detector, positioned vertically above the source, is attached to clamp T.
A student is told not to move the stands closer together.
0 1 . 1 Describe a procedure for the student to find the value of d, the vertical distance
between the open end of the source and the radiation detector.
In your answer, annotate Figure 1 to show how a set-square can be used in this
procedure.
[2 marks]
Question 1 continues on the next page
Turn over ►
*03*
IB/M/Jun21/7408/3A
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
PHYSICS
Paper 3
Section A
Time allowed: The total time for
Materials
both sections of this paper is
For this paper you must have: 2 hours. You are advised to
• a pencil and a ruler spend approximately
• a scientific calculator
• a Data and Formulae Booklet 70 minutes on this section.
• a protractor.
For Examiner’s Use
Instructions
Question Mark
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page. 1
• Answer all questions. 2
• You must answer the questions in the spaces provided. Do not write 3
outside the box around each page or on blank pages.
• If you need extra space for your answer(s), use the lined pages at the end of TOTAL
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.
• Show all your working.
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 45.
• You are expected to use a scientific calculator where appropriate.
• A Data and Formulae Booklet is provided as a loose insert.
*JUN2174083A01*
IB/M/Jun21/E8 7408/3A
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 Figure 1 shows apparatus used to investigate the inverse-square law for gamma
radiation.
Figure 1
*02*
IB/M/Jun21/7408/3A
, 3
Do not write
outside the
A sealed source that emits gamma radiation is held in a socket attached to clamp B. box
The vertical distance between the open end of the source and the bench is 138 mm.
A radiation detector, positioned vertically above the source, is attached to clamp T.
A student is told not to move the stands closer together.
0 1 . 1 Describe a procedure for the student to find the value of d, the vertical distance
between the open end of the source and the radiation detector.
In your answer, annotate Figure 1 to show how a set-square can be used in this
procedure.
[2 marks]
Question 1 continues on the next page
Turn over ►
*03*
IB/M/Jun21/7408/3A
