PASCO WA-9857 String Vibrator - Manual (Page 9)

Model No. WA-9857 Demonstration 1: String Density and Wavelength
9 ®
Demonstration 1:
String Density and Wavelength
*The recommended inelastic cord (PASCO part ME-9876) has a linear density of 1.5 g/m.
**This demonstration is easier to set up with a Sine Wave Generator (ME-9867), or another ±10 V, 1 A
function generator in place of the fixed-frequency power supply, because it allows you to adjust the driving
frequency instead of the elastic cord length.
Setup
1. Cut approximately 50 cm of the elastic cord and 80 cm of the inelastic cord. 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 about 1 meter away.
Attach a 100 g mass to the end of the inelastic cord, and run the cord over the pulley.
3. Connect the power source to the String Vibrator. If you are using the Sine Wave Generator, set
the frequency at 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)
Inelastic Cord (80 cm)* ME-9876 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, or a ~100 g mass ME-8967 or similar
Optional Equipment**
Sine Wave Generator (or equivalent) WA-9867
Banana Patch Cords SE-9750