Doppler Rocket

Video

Doppler Rocket Demonstrator (0:08)

Demonstrates a Doppler audio shift

Related Links:

• Doppler Rocket (WA-9826)

"Fly" this foam-covered rocket across the room and students hear the audio Doppler shift as it passes! Velocities of 10 m/s easily achieved, creating a 20 Hz shift in frequency.

Typical Applications

• Fly It Horizontally: Pass two ropes through the center of the unit and allow students to propel the Doppler Rocket across the room at high velocities. As it approaches as recedes they will hear the change in pitch.
• Swing It Overhead: Attach the Doppler Rocket to one end of the rope and swing it in a circular motion overhead. As it approaches the students, the pitch will sound higher, as it recedes the pitch will sound lower.
• Play Catch: An alternative to using the ropes is to have students play a gentle game of catch with the Doppler Rocket. As the rocket approaches them, they should listen for perceived increases in pitch.

Features

• Rugged -- Skinned foam protects the unit during classroom use.
• Multi-Function Handles -- The rope of the Doppler Rocket can be wound around the handles for easy storage.
• Handle Cushions -- Cushions prevent the Doppler Rocket from hitting the students' hands as they propel the rocket across the room.
• Low Power Consumption -- One 9V battery provides several years of typical use.

How It Works

The Doppler Rocket emits a true, sinusoidal sound waveform at a constant frequency of approximately 620 Hz. The circuit and speaker are housed in skinned foam that protect the unit during normal impacts. The circuit is powered by a 9V battery.