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2024 AQA A-Level PHYSICS 7408 /3A Paper 3 Section A
Verified Question Paper and Marking Scheme Attached June 2024
PHYSICS
Paper 3
Section A Monday 17 June 2024 Morning
Materials
For this paper you must have:
- a pencil and a ruler
- a scientific calculator
- a Data and Formulae Booklet
- a protractor.
Instructions
- Use black ink or black ball-point pen.
- Fill in the boxes at the top of this page.
- Answer all questions.
Time allowed: The total time for both
sections of this paper is 2 hours. You are advised to spend approximately 70 minutes on this section.
- You must answer the questions in the spaces provided. Do not write 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 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.
For Examiner’s Use Question Mark 1 2 3 TOTAL
Do not write outside the Section A box Answer all questions in this section. (^0 1) This question is based on a method to determine the resistivity of a wire (required practical activity 5). Figure 1 shows a micrometer screw gauge. Figure 1 Figure 2 shows an enlarged view of the scales. Figure 2
Do not write outside the Figure 3 shows a circuit used to determine the resistance per metre of wire X.^ box Figure 3 Two terminals are used to mount X on a ruler.
Clips are used to connect a voltmeter across the 1.2 Ω resistor. When the switch is
closed, the voltmeter reading is 931 mV.
The switch is then opened and the voltmeter is connected to X as shown in Figure 4. Figure 4
Do not write outside the
0 1. 4 When the switch is closed, the voltmeter reading is 397 mV.^ box
Show that, for the arrangement in Figure 4 , the resistance R of the wire between the clips is about 0.5 Ω.
[2 marks] Question 1 continues on the next page Turn over ►
Do not write outside the
. 6 Table 1 shows the resistance per metre of various metal wires.
The diameter of X is one of the values of d shown in Table 1.
Table 1 box
Resistance per metre of wire / Ω m−^1
d / mm copper tungsten alumel nichrome
Identify the metal used for X. Go on to determine the resistivity of the metal. State an appropriate SI unit for your answer. [4 marks]
metal used for X =
resistivity = SI unit =
Question 1 continues on the next page Turn over ►
Do not write outside the
0 1. 7 A student adds error bars for R and L to each point on Figure 5.^ box
She estimates that
- each value of R has a percentage uncertainty of 6%
- each value of L has an absolute uncertainty of 5 mm.
Compare her error bars for the point at L = 209 mm with her error bars for the point
at L = 388 mm.
[2 marks]
Do not write outside the
Figure 6 shows apparatus used to investigate how the resistance R of^ box
a light-dependent resistor (LDR) varies with illumination. Figure 6 The ohm-meter
- always displays a four-digit reading of R
- can be set to the different ranges A to E shown in Table 2. Table 2 Setting Maximum reading displayed Minimum (non-zero) reading displayed Unit
range A 199.9 000.1 Ω
range B 1999 0001 Ω
range C 19.99 00.01 kΩ
range D 199.9 000.1 kΩ
range E 1.999 0.001 MΩ
Do not write outside the (^0 2). 1 Explain why the reading displayed in Figure 6 shows that the ohm-meter is set box to range C. [1 mark]
0 2. 2 The quantity E
V is^ a^ measure^ of^ the^ intensity^ of the^ light^ incident on^ the^ LDR.
The SI unit of E V is the lux (lx).
The resistance R of the LDR is given by
log( R / Ω) = −0.772 log( E V / lx) + 5.
Show that E V for the arrangement shown in Figure 6 is about 130 lx.
[2 marks] Question 2 continues on the next page Turn over ►
Do not write outside the
It can be shown that E 1^ box
V
x^2
. 3 Describe a method to show that Figure 7 confirms this relationship. You do not need to show any calculations. [2 marks]
0 2. 4 Deduce the value of x when E
V =^130 lx.
[2 marks]
x = mm
Question 2 continues on the next page Turn over ►
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0 2. 5 R is measured when x = 450 mm.^ box
Figure 8 shows how the ohm-meter displays the values of R when set to range B and
when set to range C. Figure 8
The uncertainty of the reading on the ohm-meter is ±2% of the displayed reading
plus ±2 in the least significant digit.
This means that:
- using range B the maximum value of R is 1.02 × 1681 + 2 = 1717 Ω
- using range C the minimum value of R is 0.98 × 1.68 – 0.02 = 1.63 kΩ.
Do not write outside the Figure 9 shows the LDR being used to investigate the transmission of light through^ box glass slides. Figure 9 The lamp and ohm-meter are switched on.
R is recorded with different numbers of slides placed on the LDR.
E V is calculated for each value of R.
. 6 The positions of the lamp and the LDR are not changed during the experiment. Identify two other control variables. [2 marks] 1 2
Do not write outside the box
0 2. 8 In an experiment μ = 9.0 × 10 −^2
Deduce the minimum number of slides needed to reduce E V by 50%.
[2 marks]
number of slides =^15
(^0 2). 7 For the arrangement in Figure 9 it can be shown that
E V = 400 e− μN
where N is the number of slides
μ is a constant.
Explain how μ can be determined from a linear graph.
[2 marks] Turn over ►
Do not write outside the (^0 3). 1 Describe a method to show that the copper rod is horizontal. box Your method must include the use of a metre ruler. You may annotate Figure 10. [3 marks] Question 3 continues on the next page Turn over ►
Do not write outside the Figure 11 shows the copper rod positioned above a digital balance.^ box Two identical magnets are mounted on a steel yoke with their opposite poles facing each other. The balance is zeroed. The yoke is then placed on the balance so that a horizontal uniform magnetic field is applied perpendicular to the copper rod. The ends of the rod are connected as shown. Figure 11 0 3
. 2 When the switch is open, the reading on the balance shows the mass of the yoke and the two magnets. When the switch is closed, the reading on the balance decreases. Explain, with reference to Figure 11 , the direction of the horizontal magnetic field. [3 marks]
