Waves in Communication Technology
📋 What it is
Radio, Wi-Fi, phones and TV all encode information onto electromagnetic waves.
🗣️ Coach says
Communication rides on waves. A signal (your voice, a video, a message) is encoded onto a radio-frequency EM wave, broadcast, then decoded by a receiver. Wi-Fi, mobile phones, TV and satellites all work this way — carrying information at the speed of light.
🧠 Memory hook
Encode info onto an EM wave → broadcast → decode. Radio, Wi-Fi, phones, TV.
😂 Giggle
What did the Doppler effect say to the ambulance?
"Coming toward me? Higher pitch. Going away? Lower pitch. It's not you — it's physics!"
😲 Whoa!
A single Wi-Fi router juggles radio waves fast enough to send thousands of messages per second — invisibly filling your room with information.
✅ Quick check: How does a phone call travel wirelessly across a city?
Say your answer out loud first — then reveal.
Your voice is encoded onto radio-frequency EM waves, sent to a tower, and decoded at the other end.
Wireless comms encode information on EM waves.
🧪 Try it! (2 minutes)
Count the wireless signals around you right now (Wi-Fi, phone, Bluetooth, radio) — all EM waves.