PASCO WA-9857 String Vibrator - Manual (Page 11)

Model No. WA-9857 Demonstration 2: Closed Tube Analogy
11 ®
Demonstration 2:
Closed Tube Analogy
*With a Sine Wave Generator (ME-9867), or another a ±10 V, 1 A function generator in place of the fixed-
frequency power supply, this demonstration is easier to set up, and requires only a single mass of about
150 g rather than an adjustable set of masses.
Setup
1. Cut approximately 50 cm of elastic cord and 50 cm of black thread. Tie both pieces together
and attach the elastic cord to the blade of the String Vibrator. (Make the knots as small as
possible.)
2. Clamp the pulley at the end of the table, and clamp the String Vibrator to the table about 70
cm away. Hang a 150 g mass on the thread over the pulley.
3. Connect the power source to the String Vibrator. If you are using the Sine Wave Generator, set
the frequency to around 50 Hz, and turn up the amplitude midway.
Equipment Required Part Number
String Vibrator WA-9857
Power Supply Part of WA-9857
Elastic Wave Cord (50 cm) Part of WA-9857 (or SE-9409)
Black Thread (50 cm) ME-9875 or similar
Clamp or other device for securing the String Vibrator SE-7286 or similar
Super Pulley ME-9450
Mounting Rod for Super Pulley SA-9242
Universal Table Clamp ME-9472 or similar
Mass and Hanger Set* ME-8967 or similar
Optional Equipment*
Sine Wave Generator (or equivalent) WA-9867
Banana Patch Cords SE-9750