Interference and Resonance Review

Doppler Effect: The pitch of a sound changes based on the movement of the sound source. Approaching sound compresses waves, resulting in a higher pitch, while receding sound lengthens waves, causing a lower pitch.

Constructive Interference: Occurs when wave amplitudes combine to create a stronger wave (super crest).

Destructive Interference: Happens when waves cancel each other, resulting in reduced amplitude or weakened waves.

Comparison: Both constructive and destructive interference occur in all wave types (sound, light, etc.). Constructive interference increases wave strength, while destructive interference diminishes it.

Wave Tank Demonstration: Light and dark bands represent areas of constructive (bright bands) and destructive interference (dark bands), influencing light reflection.

Resonance Frequency: is the natural frequency at which a system oscillates with maximum amplitude

Crystal Glass Singing: Rubbing a wet finger on the rim creates vibrations at the glass's resonance frequency, producing sound. A dry finger doesn't create enough friction.

Hearing Process: The outer ear collects sound waves, the middle ear amplifies them, and the inner ear converts vibrations into nerve signals for the brain.