Why Do Radio Stations Have Numbers Like 630 AM or 102.5 FM? | How AM and FM Really Work

🎧 Ever wondered how your favourite radio station reaches you? Or why AM radio gets all that static? In this video, we break down the science of radio waves, AM and FM, and how sound travels through the air — made simple for high school students! 🌍 We explore the electromagnetic spectrum, why submarines use extremely low frequencies, how governments control radio frequencies, and even the invention of radio waves by Heinrich Hertz. Plus, we dive into the difference between amplitude modulation (AM) and frequency modulation (FM) — and why FM sounds clearer! 📚 Perfect for high school physics students or anyone curious about how communication through radio waves works. ✅ Timestamps 00:00 - Introduction: How We Send Messages Through Radio Waves 00:18 - Why Radio Waves Are Perfect for Communication 00:30 - Electromagnetic Spectrum and Radio Waves 00:45 - Why X-rays and Gamma Rays Can’t Be Used for Radio 01:00 - How Governments Control the Spectrum 01:12 - Frequency Bands Explained: ELF, VLF, and More 01:32 - AM Radio, FM Radio, and Their Frequencies 01:55 - Why TV Signals Use Ultra High Frequency (UHF) 02:24 - Heinrich Hertz: The Father of Radio Waves 02:47 - From Morse Code to Sound: The Evolution of Radio 03:00 - What is a Carrier Wave and Why It Matters 03:31 - How Radios Tune Into a Single Frequency 04:06 - How Radio Numbers (Like 102.5 FM) Relate to Frequency 04:42 - What is Amplitude Modulation (AM)? 05:53 - Why AM Radio Gets Static (Interference and Weak Signals) 07:00 - What is Frequency Modulation (FM) and Why It’s Clearer 08:06 - FM Radio: Less Static, But Overlapping Signals 08:59 - Digital Signals and Modems Explained 09:35 - How Modems Convert Digital to Analogue and Back 10:18 - Radio Waves vs Electricity: Can Radio Transmit Power? 11:01 - Amplitude Modulation Revisited with Examples 12:00 - Frequency Modulation Revisited with Examples 12:48 - Why Everyone Can’t Broadcast a Radio Station 13:32 - Recap: AM vs FM and How Sound is Encoded 🎯 Key Concepts Covered: ✔️ How electromagnetic waves carry sound ✔️ Difference between AM and FM radio ✔️ Why AM radio is static-prone ✔️ How submarines use ELF radio waves ✔️ Frequency bands and their real-world uses ✔️ Digital communication and the modem ✔️ Government regulation of the radio spectrum ✔️ Heinrich Hertz’s discovery of radio waves 💡 LIKE, COMMENT, and SUBSCRIBE if you want more easy-to-understand physics and science videos! 📖 Stay tuned for the quiz at the end to test your knowledge! #RadioWaves #PhysicsForStudents #AMvsFM #ScienceExplained #ElectromagneticSpectrum #HighSchoolScience #RadioCommunication #Modem #HeinrichHertz