Unit 3: Waves

6. When a wave bounces off a surface or boundary.
8. How loud or quiet a sound seems to a listener. Greater sound intensity is usually heard as greater loudness.
10. A wave that needs matter to travel through.
12. The distance from a wave’s resting position to its highest or lowest point. A greater amplitude means more energy.
13. A wave in which the medium moves back and forth in the same direction the wave travels.
15. When a wave passes through a material or boundary.

1. A wave in which the medium moves up and down or side to side, across the direction the wave travels.
2. The spreading or bending of a wave as it passes through an opening or around an obstacle.
3. How high or low a sound seems. Higher-frequency sounds have a higher pitch.
4. When a material takes in some of a wave’s energy instead of reflecting or transmitting it.
5. A mechanical wave made by vibrations that travels through a medium.
7. The number of waves that pass a point in one second.
9. The distance between matching points on two nearby waves, such as crest to crest or compression to compression.
11. The matter through which a mechanical wave travels, such as air, water, or a solid.
14. A disturbance that carries energy from one place to another.
16. The amount of wave energy that passes through a certain area in a certain amount of time.