Learning set 4

2. How high or low a sound is.
4. The amount of electricity, light, heat, or sound energy per unit area per unit time.
11. The spreading out of energy as it travels away from the source of the energy. The decrease in intensity as distance from an energy source increases.
12. The material through which a mechanical wave travels.
15. A measurement used to compare the intensity of different sounds. Each increase of 10 decibels is a
16. Radiation Radiant energy that can travel through a vacuum and through matter in the form of waves.
18. When the medium and energy in a wave is turned back from a hard surface.
20. of Wave The distance a wave travels (crest, trough, crest) in a given period of time. Can be calculated by multiplying wavelength by frequency.
21. A disturbance that travels through a medium from one place to another.
22. Space that contains no matter (Outer space).

1. A tiny particle or packet of light energy.
3. The time required to complete one cycle of a wave.
5. Wave A wave that causes a medium to vibrate in a direction perpendicular to the direction in which the wave travels.
6. Wave A transfer of energy through a medium without a transfer of the medium.
7. intensity 10 times greater.
8. Wave A wave that causes a medium to vibrate in a direction parallel to the direction in which the wave travels.
9. Region of a longitudinal wave where the particles of the medium have the highest density.
10. The ability of a wave to spread out or change direction as it passes through an opening or around an obstruction.
13. The change in direction of a wave when it enters a new medium with a different wave speed.
14. The height of the crest in a transverse wave; a measure of how compressed the compressions are in a longitudinal wave.
17. Caused by an earthquake or vibrations inside Earth.
19. The number of crests or compression in a wave that pass a point per unit time; for sound waves, measured in hertz.