Experiment 7 Standing wave experiment on the string
ã€Purpose requirement】
1. Observe the standing wave phenomenon formed on the strings fixed at both ends to understand the conditions for the strings to reach resonance and form a stable standing wave;
2. Determine the propagation speed of the transverse wave on the string;
3. Use the experimental method to determine the relationship between the resonance frequency and the tension when the string is forced to vibrate;
4. Use logarithmic drawing and least squares method to linearly fit the experimental results of the relationship between resonance frequency and tension, process the data, and give conclusions.
ã€Experimental Principle】
Tighten the A and B strings of both ends of a string with a certain tension. At this time, if there is a driving source between the A and B end points to make the string line undergo a simple harmonic vibration with constant amplitude near the A end, if there is a certain relationship between the length of the string line and the wavelength, some points will occur on the string The amplitude of the vibration is the largest, called the antinode; while the amplitude of some other points is zero, called the node, forming a standing wave phenomenon.
ã€Experiment content】
1. Recognize and adjust the instrument;
2. Determine the linear density of the strings used;
3. Observe the standing wave on the string;
4. Determine the propagation speed of the transverse wave on the string;
5. Determine the relationship between the resonance frequency and tension when the string is forced to vibrate.
ã€Instruments】
Serial number
equipment name
Model / Specification
Unit price (yuan)
Remarks
1
String vibration research experiment instrument
DH4618
3350
Including signal source, drive coil, detection coil
2
Weight
1kg
3
String
6 of different linear density
4
Screw caliper
LZ-1 / 0 ～ 25mm, 0.01mm
5
Level bubble
6
Dual Trace Oscilloscope
MOS620CH / 20MHz
1800
Can choose one
Digital storage oscilloscope
TH1022A / 25MHz
2450
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