charts have been made already , as. well as data obtained
HEADER
Include the name and number of experiment. Include your section number, and lab instructor’s name as well your own.
INTRODUCTION
In your own words, give a brief description of the main idea behind the experiment(s). Explain how to the topics explored in the experiment relate to the everyday world or a particular application in science. [1 point]
(the following sections might need to be repeated if there are multiple experiments in the same lab)
PROCEDURE
Describe briefly the procedure of the experiments. [1 point]
DATA/CALCULATIONS/QUESTIONS
Data – Include all tables, graphs, and figures as required. Everything must be clearly and neatly labeled. Graphs must have titles, axes need to be labeled and have units.
Tables must have titles: Table 1: Distance (m) versus Time(sec)
Do not just hand in the scrap paper you used during lab. [3 points]
Questions – Answer all questions that were listed throughout the lab. Thoughts are clear, and give justification for your answers. [3 points]
CONCLUSION
State a summary of your results. Was the result what you expected? Why or why not? Include sources of error, “human error” is not acceptable, “incorrectly counting trials leading to…” is acceptable.
Make suggestions for improving the procedure, if any. Writing and grammar should be at university levels. (i.e. spelling and grammar are correct) [2 points]
TOTAL: 10 Points
Table
of
Conten
Physics 204 – Experiment 2 – Standing Waves
Introduction
Standing Waves
Names
Introduction
Goals
Equipment Check
Warm Up Exercise
The goal of this lab is to investigate how various physical properties of a string affect its behavior
while undergoing oscillatory motion.
Experiment 1
Finished?
Equipment check
Please make sure your station has all of the following items. If not, check again, then talk to your
lab instructor.
!”#”$%%
$&’!
Slotted Mass set
12″ ruler
Meter stick
track
Wave Oscillator Unit
Sine wave generator
Thick white string
pan
Warm Up Exercise
Here are a warm up questions to get familiar with standing waves on a string.
To Do: One person holds the white stretchy string so that it is just barely taught. Another lab
partner plucks the string.
What type of wave is created?
Type of Wave? =
What mode of oscillation results?
‘
(
(
”
)*
n=?=
If the tension in the string is 10 N, and its linear mass density is 4.3 g/m, what will the frequency
of the n = 1 mode be, assuming the string is about 1 meter?
frequency =
What will happen to the linear mass density if the person holding the string stretches it? Will µ
increase, decrease, or stay the same?
How does µ change? =
Stretch the string and listen to the frequency of the string as you do so. What do you observe (or
hear) happening to the frequency
How does f change as you stretch the string? =
A little simulation
Here is a sim showing the components of standing wave. Adjust the slider to see the effects on the
standing wave.
Standing Wave – Labels
antinode
node
Experiment 1
Verify the relation between number of antinodes and the wavelength of the standing wave:
2L
=λ
n
To do this, you’ll need to take several measurements in which you change only the frequency of
oscillation, and the build a table of data that has the number of antinodes visible (n) and the
measured length of the wave. For example, the fundamental harmonic, n = 1, has a wavelength of
2L. In your lab notebook, make a table of data like this:
+,
n
(
,
λ
f
-../01
)3
/,2
1
4
(556
B
⋮
5
/
+:,;
8
-1/)7)
/
2
!/ 49
056
1.6
=>#?@A#
(-)&)(-
)5/)
N3(O–()
!#D#?
)P
A:AC@:=DAD(E
./31I)
1
.
2L
Confirm that this is the case.
1
0.5
0.33
0.25
0.2
Theoretical (m)
2
1
0.67
0.5
0.4
Relationship Between An
1.2
1
0.8
1/n
Wavelength (m)
1/n
1.88
0.98
0.78
0.49
0.4
0.6
0.4
0.2
0
0
0.2
0.4
0.6
onship Between Antinodes and Wavelength
2.5
y = 0.5462x – 0.0389
2
1/n
1.5
1
0.5
0
0
0.8
1
Wavelength (m)
1.2
1.4
1.6
1.8
2
Theoretical vs. Experimental
2.5
2
y = 1.0915x – 0.0749
1.5
1
y = 0.5462x – 0.0389
0.5
0
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
Wavelength (m)
1/n
Theoretical (m)
Linear (1/n)
Linear (Theoretical (m))
1.8
2
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