what is the number of cycles an oscillator completes in one second is known?

what is a force that always acts to pull a system back toward its equilibrium position?

what is the distance from one point on a wave to the same point in the next cycle of the wave called?

what is the bending of a wave as it crosses the boundary between two materials

what type of wave interaction occurs when a wave bounces of a surface?

a pencil is placed in a glass of water so the eraser end rests on the bottom and the pencil leans against the lip of the glass. the pencil appears to be bent at the point where it enters the water. the apparent change in the pencil's shape is caused by the phenomenon called?

the loudness of sound is measured in units called?

3 answers

I need help
1. Frequency.

2. Friction.

3. Period.

4. Refraction.

5. Reflection or Echo.

6.

7. Decibel.
Correction:
3. Wavelength.