AQA AS LEVEL
PHYSICS Paper 2
2021. A student investigates stationary waves using microwaves.
Figure 1 shows a metre ruler fixed to a bench. The student places a microwave
transmitter T at one end of the ruler and a vertical metal reflector R at the other end.
R is at a right angle to the ruler...
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AS
PHYSICS
Paper 2
Time allowed: 1 hour 30 minutes
Materials
You are advised to spend about
For this paper you must have: 35 minutes on Section C
• a pencil and a ruler
• a scientific calculator For Examiner’s Use
• a Data and Formulae Booklet Question Mark
• a protractor.
1
Instructions 2
• Use black ink or black ball-point pen. 3
• Fill in the boxes at the top of this page.
4
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write 5
outside the box around each page or on blank pages. 6–35
• 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 70.
• You are expected to use a scientific calculator where appropriate.
• A Data and Formulae Booklet is provided as a loose insert.
*JUN217407201*
IB/M/Jun21/E7 7407/2
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 A student investigates stationary waves using microwaves.
Figure 1 shows a metre ruler fixed to a bench. The student places a microwave
transmitter T at one end of the ruler and a vertical metal reflector R at the other end.
R is at a right angle to the ruler.
Figure 1
The student places a microwave detector D approximately one-third of the distance
from T to R. When T is switched off, the microammeter connected to D reads zero.
When T is switched on, stationary waves are produced between T and R, and the
microammeter registers a current. When the student moves D along the ruler, the
size of the current changes between maximum and minimum values.
*02*
IB/M/Jun21/7407/2
, 3
Do not write
outside the
The student measures the current at different positions of D along the ruler to identify box
a position P of the minimum current.
Figure 2 is a plot of the measurements taken near P.
Figure 2
0 1 . 1 Draw a line of best fit for these data.
[2 marks]
0 1 . 2 State a value for the position of P.
[1 mark]
position of P = cm
Question 1 continues on the next page
Turn over ►
*03*
IB/M/Jun21/7407/2
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