Sound

Principles Illustrated: Wave additions, beat frequency

Location: Cabinet C, Shelf 3

Two speakers are driven by two oscillators at close to the same frequency. The beat oscillations are easily distinguished.

Principles Illustrated: Interference

Location: Cabinet C, Shelf 3

Two speakers are driven by a single oscillator. With a frequency of a bout 1KHz, and placed about 1 meter apart, students can experience the interference nodes by moving from side to side in their seats.

Principles Illustrated: Doppler shift

Location: Cabinet C, Shelf 1

A single tone is produced by a speaker at the end of the long arm. When the apparatus is rotated overhead, the shift in tone is clearly demonstrated.

Principles Illustrated: Resonance of open pipe, turbulent flow effects

Location: Cabinet C, Shelf 2

A one meter tube has copper screen placed near one end. The copper screen is heated with a butane flame. Turbulent flow set up from the hot screen drives a low-order resonant mode in the tube. Tilting the tube from the vertical disrupts the flow and causes the tone to subside.

Principles Illustrated: Vibration, sound generation

Location: Cabinet C, Shelf 4

A set of tuning forks with resonant bases