Waves

4. is the spreading out of waves as they pass through an aperture or around objects.
5. is a wave with a repeating continuous pattern which determines its wavelength and frequency.
7. refers to the orientation of the vibrations of a light wave. When the vibrations are mostly in one direction,
9. is defined as the change in the direction of a wavefront at the interface between two different media, bouncing the wavefront back into the original medium.
10. a metric unit of length used worldwide by scientists to measure lengths and distances between objects.
13. is a moving wave whose oscillations are perpendicular to the direction of the wave.
15. the number of waves that pass a fixed point in unit time
17. refers to the amount of time it takes a wave to complete one full cycle of oscillation or vibration.
19. a mechanical disturbance from a state of equilibrium that propagates through an elastic material medium.
20. is electromagnetic radiation that can be detected by the human eye.

1. is a wave that is an oscillation of matter, and therefore transfers energy through a medium.
2. A wave that oscillates back and forth on an axis that is the same as the axis along which the wave propagates
3. means that a material under compressive stress reduces its volume.
6. refers to the length and width of waves, such as sound waves, as they move or vibrate.
8. is the unit of frequency in the International System of Units
11. is a point on the wave where the displacement of the medium is at a maximum.
12. is the distance the wave travels in a given amount of time, such as the number of meters it travels per second.
14. is a unit used to express the ratio of two values of a physical quantity, often power or intensity.
16. the opposite of a crest, so the minimum or lowest point in a cycle.
18. is defined as the characteristic of sound which is used for differentiating between the shrill and flat sound