Science
Waves, Light & Sound
Conceptual
12–13 yrs
The Electromagnetic Spectrum
电磁波谱
Description
Describe the full electromagnetic spectrum from radio waves to gamma rays, in order of increasing frequency and energy; explain that all EM waves travel at the same speed in a vacuum; and describe the uses and hazards of different regions
Mastery Evidence
- Lists the seven regions of the EM spectrum in order of increasing frequency
- States that all EM waves travel at 3 × 10⁸ m/s in a vacuum
- Gives at least one use and one hazard for each region of the spectrum
- Explains why some EM waves are more dangerous to living tissue than others (linked to frequency/energy)
Assessment Prompt
If your child heard about microwaves, X-rays, and visible light all being part of the same family, could they explain what makes them different from each other and name one useful application and one risk for each?
