The table below shows the entire electromagnetic spectrum. It runs in order of increasing frequency.
Three parts of the spectrum are missing.
radio waves | X | infrared | visible light | Y | x-rays | Z |
What are parts X, Y and Z?
| X | Y | Z |
A | ultraviolet | microwaves | gamma rays |
B | microwaves | gamma rays | microwaves |
C | gamma rays | ultraviolet | microwaves |
D | microwaves | ultraviolet | gamma rays |
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The table below shows the entire electromagnetic spectrum. It runs in order of increasing wavelength.
Which region is microwaves?
γ-rays | A | B | C | infrared | D | radio waves |
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The electromagnetic spectrum is shown in the table below.
γ-rays | x-rays | ultraviolet | visible light | infrared | microwaves | radio waves |
Which word is missing from the box below the electromagnetic spectrum?
Wavelength
Speed
Frequency
Amplitude
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Which list shows the parts of the electromagnetic spectrum in order of decreasing wavelength?
γ-rays, X-rays, infrared
Radio waves, ultraviolet, microwaves
Microwaves, infrared, visible light
Ultraviolet, visible light, infrared
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Which of the following groups contains only electromagnetic waves?
Sound waves, γ-rays, X-rays.
γ-rays, microwaves, sound waves.
Radio waves, infrared waves, γ-rays.
Radio waves, sound waves, microwaves.
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Which of the following sentences about infrared waves is true?
They can be used to treat cancerous tumours.
They can be used to make images of bones, through the skin.
They can be used for cooking.
They are used to send communication signals to satellites.
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Which type of electromagnetic wave is used in remote controls?
Microwaves
Visible light
Ultraviolet
Infrared
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A forgery detector is used to check whether bank notes are genuine or counterfeit. A type of electromagnetic radiation is shone onto the banknote which makes special ink in the note glow.
Which type of electromagnetic radiation is shone onto the banknote?
Ultraviolet
Infrared
Visible light
X-rays
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The table gives common uses of electromagnetic radiation.
Which row correctly matches the type of electromagnetic radiation with its use?
| Detecting banknote forgery | TV remote controllers | Sterilising medical instruments |
A | microwaves | visible light | microwaves |
B | infrared | infrared | γ-rays |
C | ultraviolet | radio waves | infrared |
D | ultraviolet | infrared | γ-rays |
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Visible, red light has a wavelength of around 700 x 10-7 m.
Two other types of electromagnetic radiation, X and Y, have different wavelengths to the visible, red light.
Wavelength of X = 400 x 10-7 m Wavelength of Y = 3.0 x 10-2 m
Which types of radiation could X and Y be?
| X | Y |
A | visible blue light | microwaves |
B | x-rays | ultraviolet |
C | infrared | radio waves |
D | microwaves | ultraviolet |
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In what way are microwaves different from ultraviolet waves?
Ultraviolet waves travel faster than microwaves in a vacuum.
Microwaves have a longer wavelength than ultraviolet waves.
Microwaves have a higher frequency than ultraviolet waves.
Microwaves are longitudinal while ultraviolet waves are transverse.
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Extended tier only
Which of the following types of electromagnetic radiation has the highest speed in a vacuum?
Microwaves
Radio waves
Visible light
None of the above
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Extended tier only
Which of the following options shows the correct speed for electromagnetic waves in a vacuum?
3.0 × 104 cm / s
3.0 × 108 cm / s
3.0 × 1010 cm / s
3.0 × 108 km / s
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Extended tier only
Mobile phone networks rely on electromagnetic radiation to transmit signals.
Which of the following statements is correct?
Radio waves are used for mobile networks because they travel over long distances and easily penetrate walls
Microwaves are used for mobile networks because they can operate with a short aerial and easily penetrate walls
Infrared waves are used for mobile networks because they travel over long distances and are not damaging to soft tissue
Ultrasound waves are used for mobile networks because they can travel to the satellites in space
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Extended tier only
Bluetooth devices rely on electromagnetic radiation to transmit signals.
Which of the following statements is correct?
Visible light is used by Bluetooth-enabled devices because it undergoes total internal reflection in optical fibres
Gamma waves are used by Bluetooth-enabled devices because they penetrate easily through walls
Microwaves are used by Bluetooth-enabled devices because they can reach satellites in orbit as they are not absorbed by the ionosphere
Radio waves are used by Bluetooth-enabled devices because they transmit very well over short distances
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Which line in the table correctly identifies a use and a danger of the electromagnetic wave given in the first column?
| EM wave | Uses | Dangers |
A. | gamma | detection of cancers | internal heating of body cells |
B. | x-rays | detecting false bank notes | mutation or damage to body cells |
C. | visible | photography | mutation or damage to body cells |
D. | infrared | thermal imaging | skin burns |
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Extended tier only
Communications engineers need to choose whether to send signals as either digital or analogue.
What is the main benefit of using digital signals?
The sound is heard more loudly
The signal may not always be clean
Signals do not need to be converted, saving time
Signals are clearer and travel more quickly
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