Waves

2. is the SI unit for frequency
3. is the human perception of the frequency of sound
6. the number of wavelengths that pass by a point each second
7. effect- an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move toward (or away from) each other
8. the units used to measure intensity of sound waves
11. wave- a mechanical wave that causes particles in matter to move back and forth along the direction the wave travels
12. repeated echoes
13. is the places where the coils are squeezed together
15. the distance from one wave of energy to another as it is traveling from one point to another point
17. an object that the wave travels through( solids, liquids, gas)
18. is the places where the coils are spread apart
20. is the lowest point in the wave

1. wave- a mechanical wave that causes particles matter to move at right angles to the direction the wave travels
4. is the highest point in the wave
5. is the change in direction of a wave
9. is the bending of waves around an object
10. wave- waves that can travel through matter and empty space, includes radio waves, infrared waves, visible light waves, ultraviolet, x-rays, gamma rays
14. is half the distance between a crest and trough
16. the amount of energy that a wave carries past a certain area each second
19. disturbance that moves through matter or space