Galton's Whistle - Physics Demonstrations - Galton's Whistle | Physics Undergraduate Labs

Ultrasonic sound may cause discomfort to younger audience members with better high-frequency hearing. Limit demonstration duration and tell students to step out if they experience discomfort. Never direct the whistle at anyone's ears.

Purpose

Galton's whistle produces very high-frequency sound at or above the limit of human hearing. Students discover that sound exists beyond audible perception -- younger audience members typically hear it while older adults cannot, illustrating age-dependent high-frequency hearing loss.

Galton's whistle mounted on a Leybold stand with rubber hose for compressed air supply

Figure 1:

Safety Warnings

Warning: Ultrasonic Exposure

Purpose