P13 Electromagnetic
waves
Exam-style questions
Name ......................................................................
0
Class ..................
Date ......................
A science teacher ran a marathon. After the race she showed her
students the silver blanket she was given to keep her warm.
1
A group of students investigated how the colour of the blanket
affected how much infrared radiation was absorbed (Figure 1).
Figure 1
0
1
.
1
Plan an investigation using the equipment shown. The first step is
done for you.
1
Fill can A and can B with the same volume of water.
2
3
4
(3 marks)
0
1
.
2
State one mistake the students made when choosing the equipment.
(1 mark)
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www.oxfordsecondary.co.uk/acknowledgements
This resource sheet may have been changed from the original.
1
P13 Electromagnetic
waves
Exam-style questions
Name ......................................................................
0
1
4
.
3
Class ..................
Date ......................
Give a reason why the infrared lamp was placed the same
distance from both cans.
(1 mark)
0
1
.
4
Suggest a suitable resolution for the thermometer.
(1 mark)
0
1
.
5
The teacher suggested the use of temperature probes instead of
the thermometers. Explain why.
(2 marks)
0
2
.
1
Give one reason why microwaves are used in mobile phones.
(1 mark)
0
2
.
2
Name the type of radiation used to link satellites to Earth.
(1 mark)
0
2
3
.
3
Give the equation that links wave speed, frequency, and wavelength.
(1 mark)
© Oxford University Press 2016
www.oxfordsecondary.co.uk/acknowledgements
This resource sheet may have been changed from the original.
2
P13 Electromagnetic
waves
Exam-style questions
Name ......................................................................
0
2
.
4
Class ..................
Date ......................
Calculate the wavelength of a wave with a frequency of
8.2  107 Hz that travels at 3.0  108 m/s.
Give your answer to three significant figures.
Wavelength =
0
2
.
5
m
(3 marks)
m
(2 marks)
A scientist measured the wavelengths of three radio waves:
2.9  103 m
2.2  103 m
8.0  102 m
Calculate the mean of the wavelengths to the nearest 100 m.
Mean =
0
2
.
6
Describe what happens when radio waves are absorbed by a
receiver aerial and before they are sent to a loudspeaker.
(2 marks)
0
3
0
3
X-rays and gamma rays are both used in medical applications.
.
1
Give one example of the use of an X-ray.
(1 mark)
0
3
.
2
Give one example of the use of a gamma ray.
(1 mark)
© Oxford University Press 2016
www.oxfordsecondary.co.uk/acknowledgements
This resource sheet may have been changed from the original.
3
P13 Electromagnetic
waves
Exam-style questions
Name ......................................................................
0
3
.
3
Class ..................
Date ......................
Give two facts about wavelength and energy transfer that are
similar for both X-rays and gamma rays.
Fact 1:
Fact 2:
(2 marks)
0
3
.
4
Describe how the production of X-rays and gamma rays is
different.
(2 marks)
0
3
.
4
Describe why gamma rays have a greater penetrating power than
X-rays.
(1 mark)
0
3
.
5
When X-rays travel from one medium to a different medium they
change direction. What is this process called?
(1 mark)
0
4
A mobile phone manufacturer publishes information about their
range of mobile phones. All phones have the same features.
The SAR value is a measure of the energy absorbed by a
person’s head (Table 1).
Table 1
Phone name
Price in £
SAR value in W/kg
A
60
1.45
B
75
0.80
C
90
1.25
D
160
0.45
© Oxford University Press 2016
www.oxfordsecondary.co.uk/acknowledgements
This resource sheet may have been changed from the original.
4
P13 Electromagnetic
waves
Exam-style questions
Name ......................................................................
0
0
4
4
.
.
1
2
Class ..................
Draw a bar graph of phone name (horizontal axis) and price
(vertical axis).
Date ......................
(3 marks)
Some scientists think that the energy absorbed by a person’s
head can be dangerous. Other scientists think that the energy
absorbed is harmless.
A man decides to buy phone C. Give one reason why this
may be a poor choice.
(1 mark)
(30 marks)
© Oxford University Press 2016
www.oxfordsecondary.co.uk/acknowledgements
This resource sheet may have been changed from the original.
5