PASCO WA-9867 Sine Wave Generator - Manual (Page 27)

Model No. WA-9867 Sine Wave Generator
27 ®
Experiment 1:
Teachers’ Notes–Standing Waves in Strings
String
Slope = 97900 Hz
2
/kg
% Deviation = 2%
Cord
Slope = 22400 Hz
2
/kg
% deviation = -2%
String Cord
m
(kg)
f
(Hz)
f 2
(Hz 2 )
f
(Hz)
f 2
(Hz 2 )
0.055 74.1 5491 34.8 1211
0.105 102.1 10424 48.2 2323
0.155 124.1 15401 58.9 3469
0.205 142.2 20221 67.7 4583
0.255 158.3 25059 75.4 5685
Density
µ
4 9.8 m/s
2
 
 
97900 Hz
2
/kg
 
  1.23 m
( ) 2
---------------------------------------------------------------- 2.65 10
4 – ×
kg/m 0.265 g/m = = = =
Actual Density
1.58 g
6.09 m
------------------- 0.259 g/m = =
Density
µ
4 9.8 m/s
2
 
 
22400 Hz
2
/kg
 
  1.23 m
( ) 2
---------------------------------------------------------------- 1.16 10
3 – ×
kg/m 1.16 g/m = = = =
Actual Density
2.36 g
2.00 m
--------------------- 1.18 g/m = =