Waves

3. rate at which something occurs or is repeated over a particular period of time or in a given sample.
5. maximum extent of a vibration or oscillation, measured from the position of equilibrium.
6. undisturbed position of particles when they are not vibrating.
7. in the density of something, especially air or gas.
8. strength and vitality required for sustained physical or mental activity.
9. to the interrelation of electric currents or fields and magnetic fields.
11. or extending across something.
12. lengthwise rather than across.

1. action of compressing or being compressed.
2. top of a mountain or hill.
3. distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
4. agency or means of doing something.
5. or produced by machines or machinery.
6. SI unit of frequency, equal to one cycle per second.
7. oscillation of the parts of a fluid or an elastic solid whose equilibrium has been disturbed, or of an electromagnetic wave.
10. long, narrow open container for animals to eat or drink out of.