Vibration of strings
Principle
A tensioned metal string is made to vibrate. The vibrations of the string are optically scanned, the vibration process observed on the oscilloscope and the dependence of the frequency on the string tension and string length and the density of the material are investigated.
Benefits
- Investigation of the dependency of the vibration frequencies of 4 parameters in one experiment
- Cross-curricularly interesting for music lessons
Photoelement
30 MHz digital storage oscilloscope with colour display,2 x BNC cables l = 75 cm incl.
PHYWE Universal Counter
PHYWE LF amplifier, 220 V
Lampholder E10, case G1
Filament lamp 6 V/3 W, E10, 10 pcs.
Support rod, stainless steel, l = 250 mm, d = 10 mm
Rod with hook
Sign holder
Fish line, l. 100m
Meter scale, l = 1000 mm
Spring balance,transparent, 100 N
Striking hammer
String tensioning device, w. stem
Distributor
Nickel wire, d = 0.3 mm, l = 100 m
Kanthal wire, 19.1 Ohm/m, d = 0.3 mm, l = 100 m
Constantan wire, 6.9 Ohm/m, d = 0.3 mm, l = 100 m
Constantan wire, 4 Ohm/m, d = 0.4 mm, l = 50 m
Copper wire, d = 0.4 mm, l = 50 m
Copper wire, d = 0.5 mm, l = 50 m
Connecting cord, 32 A, 750 mm, red
Connecting cord, 32 A, 750 mm, blue
Plug with push-on sleeve
Screened cable, BNC, l 250 mm
Screened cable, BNC, l = 750 mm
Adaptor, BNC socket/4 mm plug
Connector, T type, BNC
Adapter, BNC-plug/socket 4 mm
Adapter, BNC socket/4 mm plug pair
Right angle clamp expert
Barrel base expert
Bench clamp expert
Tasks
- To measure the frequency of a string (e.g. constantan, 0.4 mm dia.) as a function of the tensioning force and the length of the string.
- To measure the frequency for various types and cross-sections of string, at a fixed tension and string length.
What you can learn about
- Natural vibration
- Mass-spring system
- Harmonic sound intervals