Electromagnetic Waves & the Spectrum
📋 What it is
Each EM band — from radio to gamma — carries different energy and has different uses and dangers.
🗣️ Coach says
Across the EM spectrum, shorter wavelength means higher energy. Radio and microwaves are low-energy and safe for communication and heating; visible light we see; ultraviolet, X-rays and gamma rays carry high energy that can burn skin or damage cells — useful in medicine but dangerous in large doses.
🧠 Memory hook
Shorter wavelength = higher energy. Radio (low, safe) → … → gamma (high, dangerous).
😂 Giggle
What did the infrared wave say at the party?
"You can't see me, but you can FEEL my warmth!"
😲 Whoa!
The same X-rays that let a doctor photograph your bones would harm you in large doses — which is why the technician steps behind a shield for each shot.
✅ Quick check: Which carries more energy — radio waves or X-rays?
Say your answer out loud first — then reveal.
X-rays — shorter wavelength means higher energy (radio is low-energy).
EM energy rises as wavelength shortens.
🧪 Try it! (2 minutes)
List three EM waves you used today (Wi-Fi=radio, remote=infrared, light=visible) and rank their energy.