The weakest of the four fundamental forces.
What is the gravitational force?
Regions of high pressure in a longitudinal wave.
What are compressions?
The SI unit for sound intensity.
What is the decibel?
Resonance occurs when an object vibrates at this.
What is their natural frequency?
The apparent change in the frequency of a wave caused by the relative motion between the source of the wave and the observer.
What is the doppler effect?
What occurs when two waves interact with each other and are out of phase
What is destructive interference?
The distance from the equilibrium point to the crest of a wave.
What is it's amplitude.
The bending of a wave caused by the change in speed as it moves from one medium to another.
What is refraction?
The names of Ron Weasley's twin brothers.
Who are Fred and George?