Across
- 5. the radio waves with the shortest wavelength
- 8. the complete range of electromagnetic waves
- 13. a method of transmitting signals by changing the frequency of a wave
- 15. a system that used reflected radio waves to detect objects and measure their distance and speed
- 16. if it gives off it's own light it is
- 17. you use this to view the different colours a light bulb gives off
- 18. if you see it by reflected light it is
- 19. electromagnetic waves with wavelengths shorter than visible light
Down
- 1. a bulb that contains neon or argon gas and a small amount of solid sodium or mercury
- 2. a bulb that contains a gas and is coated on the inside with a powder
- 3. electromagnetic waves you can see
- 4. a bulb that has tungsten filament and contains a halogen gas such as iodine or bromine
- 6. a method of transmitting signals by changing the amplitude of a wave
- 7. electromagnetic waves with the shortest wavelengths
- 9. a bulb that glows when a filament inside gets hot
- 10. an image that shows different temperature in different colours
- 11. electromagnetic waves with wavelengths just shorter than ultraviolet rays
- 12. the electromagnetic waves with the longest wavelengths and lowest frequencies
- 14. electromagnetic waves with wavelengths shorter than radio waves