6)
Open “Lab W Waves on a String_103A” file in “Physics 103A Lab Experiments” folder
on Desktop.
7)
Plug the force sensor to “PASPort 1” input and press “Zero” button on the sensor with no
force applied to the force sensor.
8)
Start system vibrating and adjust tension carefully by pulling the force sensor away from
the string vibrator so that the string vibrates in a fixed number of segments.
9)
Obtain various standing waves by adjusting tension. Measure the tension to produce each
standing wave case by clicking “Monitor” on the bottom of screen. Make sure that the
string has very defined standing waves by pulling the force sensor to create the tension.
10) Calculate the wavelength for each case of standing wave by using the number of the
segments and the length of the string. It might be easier to measure L and divide by n/2 to
get wavelength.
11) From the data taken, plot a graph showing the relationship between tension F and the
square of the wavelength. Fit data with regression line and calculate frequency of the
vibrator
f
from slope of the regression line.

Results/Data Sheet
Number of
loops, n
Mass
(g)
Weight (tension)
(N)
Distance between
nodes (cm)
String length
(cm)
Wavelength,
λ
n
(cm)
3
140
1.372
33
100
66
4
70
0.686
25
100
50
5
40
0.392
20
100
40
6
30
0.294
16.7
100
33.4
7
18
0.176
14.3
100
28.6
8
14
0.137
12.5
100
25
Figure A – Recorded data per # of loops
Figure B – Graphic interpretation of Tension vs Wavelength Squared
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.37
0.69
0.39
0.29
0.18
0.14
f(x) = 0x - 0.1
Fitted Tension vs Wavelength Squared
Wavelength Squared
Tension
Frequency calculation:
λ = (
F
/µ
)^
0.5
x (1/
f
) , where m is the slope
f
=
(
(
F
/µ
)^
0.5
) / λ
Wavelength(cm)
Frequency
66
3.03 x 10^-4

50
4 x 10^-4
40
5 x 10^-4
33.4
5.988 x 10^-4
28.6

#### You've reached the end of your free preview.

Want to read all 5 pages?

- Spring '16
- Frequency, Wavelength, Standing wave