SOUND & EM SPECTRUM

4. The characteristic of sound that depends on frequency.
6. Electromagnetic waves used in satellite communication and cooking.
9. The characteristic of sound that depends on amplitude.
11. Sound waves with frequencies above 20 000 Hz.
13. The complete range of electromagnetic waves arranged by frequency or wavelength.
15. The type of wave where particles vibrate parallel to the direction of energy transfer.
16. The electromagnetic wave used for broadcasting and communication.
17. A type of wave that requires a medium to travel through.
19. The SI unit used to measure frequency.
20. Waves that can travel through a vacuum and do not need a medium.

1. The electromagnetic wave with the highest frequency and energy.
2. The only part of the electromagnetic spectrum detected by the human eye.
3. Electromagnetic radiation that can cause sunburn.
5. The distance between two consecutive points on a wave, such as crest to crest.
7. A reflected sound wave heard after the original sound.
8. Electromagnetic waves used for medical imaging of bones.
10. A technology that uses reflected sound waves to detect underwater objects.
12. The maximum displacement of particles from their rest position.
14. Electromagnetic radiation associated with heat.
18. The number of complete waves passing a point each second.