Exam (elaborations)
as level paper 2 aqa 2019
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Please write clearly in block capitals.Centre number Candidate number
Surname
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Candidate signature
AS
PHYSICS
Paper 2
Friday 17 May 2019 Morning Time allowed: 1 hour 30 minutes
You are advised to spend about
Materials
For this paper you must have: 35 minutes on Section C
• a pencil and a ruler
• a scientific calculator
• a Data and Formulae Booklet. For Examiner’s Use
Instructions Question Mark
• Use black ink or black ball-point pen. 1
• Fill in the boxes at the top of this page.
2
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write 3
outside the box around each page or on blank pages. 4
• Do all rough work in this book. Cross through any work you do not want
5–34
to be marked.
• Show all your working. TOTAL
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 70.
• You are expected to use a scientific calculator where appropriate.
• A Data and Formulae Booklet is provided as a loose insert.
*JUN197407201*
IB/M/Jun19/E9 7407/2
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 This question is about the measurement of the wavelength of laser light.
The light is shone onto a diffraction grating at normal incidence.
The light transmitted by the diffraction grating produces five spots on a screen. These
spots are labelled A to E in Figure 1.
Figure 1
A student uses a metre ruler with 1 mm divisions to take readings. He uses these
readings to obtain measurements a, b and c, the distances between centres of the
spots as shown in Figure 1.
Table 1 shows his measurements and his estimated uncertainties.
Table 1
Measurement Distance / mm Uncertainty / mm
a 289 2
b 255 2
c 544 2
*02*
IB/M/Jun19/7407/2
, 3
Do not write
outside the
0 1 . 1 Explain why the student’s estimated uncertainty in measurement a is greater than the box
smallest division on the metre ruler.
You should refer to the readings taken by the student in obtaining this measurement.
[2 marks]
0 1 . 2 The distance between the centres of spots A and C and the distance between the
centres of spots C and E are equal.
That is:
a+b=c
Calculate the percentage uncertainty in the sum of a and b.
[2 marks]
percentage uncertainty =
Question 1 continues on the next page
Turn over ►
*03*
IB/M/Jun19/7407/2
, 4
Do not write
outside the
0 1 . 3 Discuss why the experimental measurements lead to a different percentage box
uncertainty in c compared to that in a + b.
[2 marks]
0 1 . 4 Eye protection should be used to prevent eye damage when using a laser.
Describe one other safety measure to minimise the risk of eye damage when using a
laser in the laboratory.
[1 mark]
0 1 . 5 Figure 2 shows the experimental arrangement with y, the perpendicular distance
between the diffraction grating and the screen, equal to 1.280 m.
Table 2 shows some of the data from Table 1.
Table 2
Measurement Distance / mm
a 289
b 255
c 544
*04*
IB/M/Jun19/7407/2
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