Waves

2. the perception of how high or low a sound seems
4. a material that allows most of the light that strikes it to pass through, but appear blurry
5. a wave that travels only through matter
13. a material through which light does not pass
14. the region of a longitudinal wave where the particles are farthest apart
17. the change is direction of a wave as it changes speed,moving from one medium into another
18. the unit used to measure sound intensity, or loudness

1. a wave that can travel through empty space and matter
3. the amount of energy that passes through a square meter of space in one second
6. the number of wavelengths that pass a point each second
7. an electromagnetic wave with a slightly shorter wavelength and higher frequency than light
8. the region of a longitudinal wave where the particles of the medium are closest together
9. a wave that makes the wave particles move back and forth parallel to the direction the wave travels.
10. a low-frequency, low-energy electromagnetic wave that has a wavelength longer than about 30cm
11. a material that allows almost all of the light striking it to pass through, and through which objects can be seen clearly
12. an electromagnetic wave with a wavelength shorter than a microwave but longer than light
15. the maximum distance a wave varies from its rest position
16. a wave in which the disturbance is perpendicular to the direction a wave travels