Waves

2. – The length of one full wave cycle.
3. – What's needed to make something happen or change.
5. – A sound's position on the high-to-low scale.
6. – A wave rebounding after hitting a barrier.
8. – How far a wave's peak or trough sits from the middle line.
9. – A wave that needs a medium to travel and can be picked up by our ears.
11. – When a material soaks up wave energy rather than letting it pass or bounce off.
12. – A measure of how soft or loud a sound is.
13. – A crowded region in a longitudinal wave.
16. – Why a siren sounds different as it moves past you.
19. – How many complete waves occur in one second.

1. – A disturbance carrying energy from place to place, without moving matter along with it.
3. – A family of waves that can travel through empty space (vacuum).
4. – The only part of the EM spectrum humans can detect with their eyes.
7. – Movement of an object as its position changes with time.
10. – A wave type where the medium moves back and forth in line with the wave's direction.
14. – A wave changing direction as it enters a new material at an angle.
15. – A wave type where the medium moves up and down while the wave moves sideways.
17. – A thinly spread-out region in a longitudinal wave.
18. – How quickly a wave covers distance.