Interference and Resonance Review

Doppler Effect

The change in pitch of a sound based on the movement of the sound source, with approaching sound compressing waves for a higher pitch and receding sound lengthening waves for a lower pitch.

Constructive Interference

Occurs when wave amplitudes combine to create a stronger wave.

Destructive Interference

Happens when waves cancel each other, resulting in reduced amplitude.

Comparison of Interference Types

Both constructive and destructive interference occur in all wave types; constructive increases wave strength, while destructive diminishes it.

Wave Tank Demonstration

A demonstration showing light and dark bands that represent areas of destructive (bright) and constructive (dark) interference.

Resonance Frequency

The natural frequency at which an object vibrates most effectively.

Crystal Glass Singing

Producing sound by rubbing a wet finger on the rim of a glass cuasing fluid friction to vibrate the glass it at its resonance frequency; a dry finger does not create enough friction.

Hearing Process

The process by which the outer ear collects sound waves, the middle ear amplifies them, and the inner ear converts vibrations into nerve signals for the brain.