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Unit 14
Tech Exploration

From waves to sound

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1
How radio travels

Placeholder pour Diagram showing how radio travels from a Transmitter through an Antenna via Radio wave and Tuning frequency to a Receiver.Diagram showing how radio travels from a Transmitter through an Antenna via Radio wave and Tuning frequency to a Receiver.

“How does a radio work?”, Physics Insight, 2020.
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Culture note

Radio waves are a type of electromagnetic energy that can travel through the air without wires (which is why radio is also called “wireless”). Because of their long wavelengths, they can carry signals over great distances, making large-scale communication possible.
First used for broadcasting voice and music, radio-wave technology now supports many modern systems, including mobile phones, Wi-Fi, GPS and satellite links. Today's connected world still relies on the same scientific foundations developed in the early days of radio.
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2
Timeless tech

Placeholder pour Diagram showing how radio travels from a Transmitter through an Antenna via Radio wave and Tuning frequency to a Receiver.Diagram showing how radio travels from a Transmitter through an Antenna via Radio wave and Tuning frequency to a Receiver.
Keystone-France/Getty

“How radio survived every tech revolution”, Ofcom, 2025.
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Several inventors in Europe and North America experimented with wireless signals in the late 19th century. In 1896, it was Guglielmo Marconi, an Italian scientist working in the UK, who patented the first apparatus for long-distance radio communication. Marconi's invention was later credited with saving the lives of the 700 people who survived the tragic Titanic disaster in 1913 .
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Communication

1-A
Find quotes in the documents that show how radio changed the way people communicate.
2-A
In your own words, explain why radio remained popular even after the invention of TV, CDs, and streaming.
3-A
Pick one example of how radio connects with audiences today. Why is it still important?
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Science

1-B
Explain in your own words what modulation is and why it is necessary for radio communication.
2-B
How do AM and FM radio transmit sound differently? Explain in your own words.
3-B
Pick one technological change and explain how it allowed radio to reach more people.
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Over to you!

Communication
Create a social media post.
Create a visual social media post aimed at teenagers today, explaining why radio is still important and how it connects people. Include interesting facts or quotes you found in the documents.



Science
Create a poster.
Design a “radio timeline” poster showing the key technological changes in radio from the first transmitters to digital broadcasting. For each step, include a simple diagram and a short explanation.
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