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Physics Quiz - Waves - The use of Waves in Communications (Questions)

This GCSE Physics quiz explores how waves carry information, from radio broadcasts and mobile phones to satellite links and fibre optics sending signals rapidly across the world.

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(quiz starts below)

Fascinating Fact:

Microwaves are used to send signals to and from satellites, because they can pass through the Earth’s atmosphere with little absorption.

In GCSE Physics Waves, you learn how electromagnetic and sound waves carry information. Different frequencies are used for radio, mobiles, Wi-Fi, satellites and fibre optics to send signals reliably over long distances.

Key Terms

  • Carrier wave: A high-frequency wave that is changed to carry information, for example in radio or TV broadcasts.
  • Digital signal: A signal with only two states, usually on or off, used in computers and modern communication systems.
  • Attenuation: The gradual loss of signal strength as a wave travels through a medium or over a distance.

Frequently Asked Questions (Click to see answers)

How are electromagnetic waves used for communication in GCSE Physics?

Electromagnetic waves such as radio, microwaves, infrared and light are used to carry information. They transmit signals for radio, TV, mobile phones, Wi-Fi, fibre optics and satellite links.

Why are microwaves useful for satellite communication?

Microwaves have wavelengths that allow them to pass through most of the atmosphere with little absorption. They travel in straight lines and can be focused by dish aerials to send and receive satellite signals.

What is the difference between analogue and digital signals?

Analogue signals vary continuously and can pick up noise, while digital signals use two levels, usually 0 and 1, making them easier to clean up and transmit accurately over long distances.

Try These Related Quizzes

1. How is the speed of sound calculated?
[ ] Distance divided by time
[ ] Time divided by distance
[ ] Distance multiplied by time
[ ] Time multiplied by distance
2. Which of the following statements is true?
[ ] The speed of sound is the same for all materials
[ ] The speed of sound is different for different materials
[ ] The only material that affects the speed of sound is water
[ ] Sound can only travel in a vacuum
3. Which of the following types of waves do not need any matter to travel in?
[ ] Electromagnetic waves
[ ] Sound waves
[ ] Water waves
[ ] Mechanical waves
4. Which of the following statements is true?
[ ] Waves all have the same amplitude
[ ] Waves carry energy
[ ] Waves cannot be used to transmit signals
[ ] Waves do not vibrate
5. Which of the following waves are transverse?
[ ] Sound waves and mechanical waves
[ ] Water waves and sound waves
[ ] Electromagnetic waves and sound waves
[ ] Electromagnetic waves and water waves
6. Which of the following waves are longitudinal?
[ ] Sound waves
[ ] Electromagnetic waves
[ ] Water waves
[ ] Infra-red waves
7. A wave machine produces 15 waves per second. What is the frequency of the waves?
[ ] 10 Hz
[ ] 0.06 Hz
[ ] 15 Hz
[ ] 20 Hz
8. If the waves above travel 10 metres in 5 seconds, what is the speed of the waves?
[ ] 1 m/s
[ ] 2 m/s
[ ] 4 m/s
[ ] 0.5 m/s
9. Considering your answers to question 7 and 8, what is the wavelength of the waves produced by the wave machine?
[ ] 0.13 m
[ ] 0.25 m
[ ] 0.50 m
[ ] 0.75 m
10. What is the wavelength of a wave?
[ ] The distance from a crest of a wave to a trough of the next wave
[ ] The distance between four crests of waves
[ ] The distance between any point on one wave to the same point on the next wave
[ ] The distance between four troughs of waves

You can find more about this topic by visiting BBC Bitesize - Electromagnetic waves and radar

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Physics Quiz - Waves - The use of Waves in Communications (Answers)
1. How is the speed of sound calculated?
[x] Distance divided by time
[ ] Time divided by distance
[ ] Distance multiplied by time
[ ] Time multiplied by distance
The speed of sound is treated the same way as calculating any other speed by dividing the time taken for an object to reach a point B from A. A question in an exam may ask you to work out the speed of sound to answer another part of a question, or if not this will be given to you
2. Which of the following statements is true?
[ ] The speed of sound is the same for all materials
[x] The speed of sound is different for different materials
[ ] The only material that affects the speed of sound is water
[ ] Sound can only travel in a vacuum
This is the same for all waves, for example, light travels more slowly in glass than in air or a vacuum
3. Which of the following types of waves do not need any matter to travel in?
[x] Electromagnetic waves
[ ] Sound waves
[ ] Water waves
[ ] Mechanical waves
They are vibrations of electric and magnetic fields that exist throughout the universe
4. Which of the following statements is true?
[ ] Waves all have the same amplitude
[x] Waves carry energy
[ ] Waves cannot be used to transmit signals
[ ] Waves do not vibrate
All waves carry energy
5. Which of the following waves are transverse?
[ ] Sound waves and mechanical waves
[ ] Water waves and sound waves
[ ] Electromagnetic waves and sound waves
[x] Electromagnetic waves and water waves
The vibrations are perpendicular to the direction the energy is travelling
6. Which of the following waves are longitudinal?
[x] Sound waves
[ ] Electromagnetic waves
[ ] Water waves
[ ] Infra-red waves
Sound waves travel by exchanging vibrational energy between nearby particles. If there are no particles then the sound wave cannot be transmitted
7. A wave machine produces 15 waves per second. What is the frequency of the waves?
[ ] 10 Hz
[ ] 0.06 Hz
[x] 15 Hz
[ ] 20 Hz
One hertz is one wave per second
8. If the waves above travel 10 metres in 5 seconds, what is the speed of the waves?
[ ] 1 m/s
[x] 2 m/s
[ ] 4 m/s
[ ] 0.5 m/s
Speed = distance divided by time
9. Considering your answers to question 7 and 8, what is the wavelength of the waves produced by the wave machine?
[x] 0.13 m
[ ] 0.25 m
[ ] 0.50 m
[ ] 0.75 m
The wavelength of any wave is its speed divided by its frequency
10. What is the wavelength of a wave?
[ ] The distance from a crest of a wave to a trough of the next wave
[ ] The distance between four crests of waves
[x] The distance between any point on one wave to the same point on the next wave
[ ] The distance between four troughs of waves
It is usually drawn as being from crest to crest or trough to trough
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