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Demonstration Buzzer

Demonstration Buzzer AP6856
Catalog Number
Demonstration Buzzer
Product Description

Easily demonstrate the Doppler effect and fundamental principles of sounds. Tie a string to the buzzer and spin the buzzer over your head. Student will clearly hear the Doppler effect as the buzzer moves toward them and then away from them. Battery and buzzer are secure so there is no worry of the battery disconnecting. An optional second demonstration may be performed with a vacuum pump and bell jar to show students that sounds do not exist in the vacuum of space. Kit includes a reproducible student worksheet and detailed Teacher Notes with teaching tips, instructions, and background information for both demonstrations. Materials Provided: Buzzer, foam block, rubber band, string. A 9-V battery is required and available separately.


Batteries, Transistor, Alkaline, 9.0 V

The AAA, AA, C, D, and 9 V batteries shown are all alkaline batteries. Consumer Reports states that while alkaline batteries cost three to five times more than acidic batteries, alkalines last 10 times longer.
Small Bell Jar with Molded Knob, Glass, 3.5-L
High quality, flint glass bell jars. Glass is crystal clear, allowing students to easily view experiments performed inside the jar. Bell jars with ground glass stopper offer the flexibility for evacuation or for pressurizing the inside of the jar using...
Vacuum Plate, Economy Choice
This durable polyethylene vacuum plate with rubber gasket is an excellent choice when budgets are tight! Use this plate with the small glass bell jars (AP6655 and AP6656). Accepts 1/4" i.d. tubing. Plate dimensions: 24 cm x 24 cm.
Tubing, Vacuum, 10 Ft.
Extra thick-walled black rubber tubing is great for all your vacuum applications. This machine-made tubing is guaranteed not to collapse under normal conditions. Supplied in 10-foot lengths. Inside diameter is 1/4" and the wall thickness is 3/16"....
Pump, Vacuum, Two-Stage
The most durable two-stage pump you can buy. This quiet, dependable vacuum pump will produce a high-quality vacuum when performing experiments where a very low pressure is needed—boiling water at room temperature, etc. The rotary sliding vane produces...
Additional Resources
Flinn Catalog/Reference Manual Page 714
Flinn Middle School Catalog/Reference Manual Page 465
P.O. Box 219, Batavia, IL60510



*Advanced Placement and AP are registered trademarks of the College Board, which was not involved in the production of, and does not endorse, these products.