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Lab Assignment: Speed of Sound
Name: Please watch the following:
https://youtu.be/CM5IFM0N1bE
In the video the instructor will use properties of sound waves to determine the speed of sound. This is done by using the properties of waves that allow standing waves to form.
A known frequency transverse sound wave is projected down a closed column and reaches column end. The sound wave is reflected along the column opposite in direction to that of the incident wave. The two waves combine so that there is no propagation of energy along the wave.
The wave displacements are constant and remain fixed in location. This is called a standing wave
because the two waves of equal amplitude and wavelength do not appear to be traveling. Standing waves are formed in strings of musical instruments and in the air in an organ pipe, a flute, and other wind instruments. Standing waves can then be produced in a column of proper length.
In this experiment the length of the column is controlled by water contained in the tube. The length is adjusted to allow standing waves to occur for different harmonics of the fundamental frequency.
Ewen, Dale; Neill Schurter, P. Erik Gundersen. Applied Physics (10th Edition) (Page 425-431). Pearson HE, Inc. Kindle Edition.
R
eview the video and please complete the table below according to the instructions given there.
Frequency
(Hz)
n
L
(
m
)
4
L
/
n
v
=
(
4
L
n
)
f
T
=
1
f
256
1
31cm= 31/100=0.31m
1.24m
317.44m/s
0.0039s
512
1
15cm= 15/100=0.15m
0.6m
307.2m/s
0.0020s
512
3
47cm= 47/100=0.47m
0.627m
321.02m/s
0.0020s
1000
5
41cm= 41/100=0.41m
0.328m
328m/s
0.001s
1000
3
25cm= 25/100=0.25m
0.33m
330m/s
0.001s
1000
1
7cm= 7/100=0.07m
0.28m
280m/s
0.001s
Average v
=
¿
305.6m/s
List possible error sources The biggest error I think would be human error as everyone’s results probably vary at least a little from one another. After completing the table upload to Canvas.
Lab Assignment: Speed of Sound
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Related Questions
The diagram below shows wavefronts of waves incident on a boundry XY between medium M, and another medium M2
wavefronts
Y
normal
direction of travel
309
M,
M,
The angle between the normal and the direction of travel of the wavefronts is 30°.
The Frequency of the wave in M1 is 36 Hz. The speed of the wave in M1 is 0.8 m/s. The speed of the waves in M2 is 0.95 m/s Calculate the angle between the direction of travel of the
wavefronts in M2 and the normal.
What is the frequency of the wave in M2?
?
What is the wavelength of the wave in M1?
What is the wavelength of the wave in M2?
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Additional Materials
O Reading
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Question 8 of 10
View Policies
Calonmetry Proble...
<
Current Attempt in Progress
9
New folder
As the drawing shows, one microphone is located at the origin, and a second microphone is located on the +y axis. The microphones are
separated by a distance of D = 1.35 m. A source of sound is located on the +x axis, its distances from microphones 1 and 2 being L₁ and
L2, respectively. The speed of sound is 342 m/s. The sound reaches microphone 1 first, and then, 1.66 ms later, it reaches microphone 2.
Find the distances (in m) (a) L₁ and (b) L2.
Microphone 2
Microphone 1
L1
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-/1 E :
+1
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Part A
What is its wave number?
Express your answer with the appropriate units.
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Previous Answers Request Answer
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ound wave in air.
b) In water the speed of sound is different. The speed of a sound wave in water is
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A state highway patrol car radar unit uses a frequency of
6.50x10° Hz .
Part A
What frequency difference will the unit detect from a car receding at a speed of 64.5 m/s from a stationary patrol car?
?
Af =
Hz
Submit
Request Answer
Provide Feedback
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For items 1-2, choose only one correct answer.
1. What is the speed of sound when the temperature is 39°C in aluminum?
A. 5119.2 m/s
B. 5122.2 m/s
C. 5123.4 m/s
D. 5127.4 m/s
2. What is the gravitational field strength in N/kg on the surface of the sun?
Given:
r= 6.96x10^8 m
m= 1.99x10^30 kg
A. 1.6
B. 9.8
C. 127
D. 274
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Name
Chapter 26 Sound
Relating Properties of Sound
A musical note has a frequency of 264 Hz. What is the wavelength of the
sound if it moves with a speed of 345 m/s?
1. Read and Understand
What information are you given?
speed of the sound wave = v= 345 m/s
frequency of the sound wave = f = 264 Hz
2. Plan and Solve
Cla
ban
What unknown are you trying to calculate?
wavelength = 2
Replace each variable with its known value.
345 m/s
264 Hz
onsiq sil
What relationship can you use to find the unknown?
wave speed = wavelength x frequency: v = Af
Rearrange the equation to solve for the unknown variable.
bno
2 = 7
λ =
Is
= 1.3 m
roustrando
ased wari nislqxe of spaus
si to
grinut ono seoqque
Sas estsidiy
ahot erli
to vanoupont art
Since antwoll
9nul to 100
3. Look Back and Check
your answer reasonable?
A speed of 345 m/s indicates that the medium through which the sound
is traveling is probably air. A sound with a frequency of 264 Hz is an
audible sound. The wavelength of 1.3 m is reasonable…
arrow_forward
Calculate the wavelengths in air at 20°C for sounds
in the maximum range of human hearing. The
speed of sound in air is 343 m/s.
Part A
Calculate the wavelength of a 20-Hz wave.
Express your answer to two significant figures and include the appropriate units.
Alow =
Submit
Part B
Ti
μA
Value
Request Answer
Units
ΜΑ
?
Calculate the wavelength of a 20,000-Hz wave.
Express your answer to two significant figures and include the appropriate units.
?
arrow_forward
m/public/activity/6004002/assessment
Google
Redirecting...
G.
M Mail
G Images
M Wrie
Zearn Math: A Com.
1 6.4.2 Teat (CST): Waves
Question 1 of 13
A student rings a brass bell with a frequency of 100 Hz. The sound wave
travels through brass, air, and glass. What is the wavelength of the wave in
brass?
Wave speed
(m/s)
Medium
Brass
4,700
Air
346
Glass
5,640
A. 47 m
B. 4.7 m
C. 0.021 m
D. 0.21 m
PREVIOUS
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Waves in a Pool O
While in the pool, you splash water and produce a wave that
completes 3 complete cycles in 2 seconds. The pool is 24 meters
long. Use the diagram below to help you answer the following
questions.
The frequency of the waves are
type your answer.
Hz.
Pool
Pool
Side
Side
24 meters
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utton - Science 7-C x
Wave Frequency | CK-12 Found. x
G wave is the number of wave that x
view/practice/physics/wave-frequency-practice&branch%3physics&assignmentid%38512548&referrer%3DGrou
cK-12 wave Frequency
1/10
What is the SI unit for wave frequency? (Spell out the answer.
Do not give the symbol.)
Enter the answer
Check it
20 SCRATCHPAD
A Improve this questlor
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A source makes waves in a string, as shown in the following diagram. It takes 0.45 seconds for
the waves to travel from point X to point Y. Complete the following questions.
45m
a) Find the wavelength in metres.
b) Find the speed of the wave in metres per second.
c) Find the frequency.
d) Find the period.
e) What would happen to the speed of the wave and the wavelength if the frequency of the force
were doubled.
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GHT
1.5
1.6
stive
Structive
he disturbar
int X. the ty
For each diagram, A and B, state whether the
waves are in phase or out of phase.
Diagram A
Diagram B
The diagram indicates two points X and Y on
a wave train. The distance between X and Y
is 45 cm. Use the diagram to answer
the questions.
20 cm
1.6.1 What is the wavelength of the wave?
A 45 cm
B 60 cm
C 30 cm
D 15 cm
A 0,2 Hz
C 0,4 Hz
1.6.2 The series of waves on the sketch
arose in 0,4 s. The frequency of the
wave train is:
B 5 Hz
D 2,5 Hz
1.6.3 The speed of this wave is:
A 1,8 m-s1
C 0,15 m s
B 0,09 m-s1
D 1,5 m-s1
1.8 r
A
Qu
2.1
2.3
2.
2
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edures
Useful Links
Help»
EThis module
* Participants
pased on Chapter-11
ICS
The distance between two adjacent nodes of a stationary wave is 0.1 m. Its wavelength is
Select one:
a. 0.05 m
b. О.2 m
cion
с. О.1 m
Previous page
Chapter-12 C
ctice Quiz Experiment-1, T-2, AY
20-21
Jump to...
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Question 2
Q Zoom
Question 2
If a wave is traveling at a certain speed and the frequency is increased, what will happen to its wavelength?
The wavelength will increase.
The wavelength will produce a standing wave.
The wavelength will remain the same.
The wavelength will decrease.
©2021Illuminate Education TM, Inc.
B.
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Question 3
Select all of the characteristics that can be used to describe all types of waves.
A
period
B.
crest
amplitude
trough
frequency
wavelength
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How many times a minute does a boat bob up and down on ocean waves that have a wavelength of 36.0 m and a propagation
speed of 4.80 m/s?
Additional Materials
O Reading
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For items 1-2 choose only one correct answer.
1. What is interference?
A. It occurs when two or more waves overlap and combine.
B. It occurs when two or more waves combine and neutralize each other
C. The maximum displacement of a wave from its equilibrium position.
D. The distance between two identical positions on two consecutive waves.
2. Which of the following statements is TRUE when two waves temporarily interfere with each other then resume their course movement?
A. Both waves counteracted and cease to exist.
B. They take on and keep a new amplitude based on the result of the interference until the end of the movement.
C. They are not affected by the interference and maintain their original amplitude throughout the movement.
D. They are temporarily affected by the interference, created new amplitude but resume on their original amplitude until the end of the movement.
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A Click Submit to complete this assessment.
Question 3
An underwater vehicle sends out a short sound. An echo of the sound is perceived 6.84 s after sending the pulse. If the speed of sound in the ocean is 10,191 m/s, how far away is the reflecting surface?
Round off answer to the nearest whole number. Input both the number and the symbol of the unit.
arrow_forward
In Figure below the hand moves the end of the Slinky up and down through two complete cycles in one second. The wave moves along
the Slinky at a speed of 0.447 m/s. Find the distance between two adjacent crests on the wave.
Number i
Units
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3 Wave properties
A sinusoidal wave, graphed above at time t = 0 seconds, travels right with velocity 8.0 m/s.
Being sure to specify units...
t = 0
y
v = 8 m/s
-7 m
Problem 3.1. What is this wave's amplitude ym?
Problem 3.2. What is its wavelength \?
Problem 3.3. What is its wavenumber k?
5 m
x
arrow_forward
2:19
phys.libretexts.org
ou may want to repeat this activity a few
nes to make sure you are reading the
graph and the stopwatch accurately.
Show your work here:
Open-Ended Submission Type:
None
◆ Update Type
Show your work here:
Open-Ended Submission Type:
None
◆ Update Type
What is the frequency that you find
for a wave with a wavelength of 150
m?
Hz
Preview My Answers
Submit Answers
How can we help
SSO
%D
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Question 3 Write down the mathematical function for a wave whose maximum ampli-
tude is 3 m, and which travels with a speed of 350 m/s. Let the linear frequency of this
wave be 1000 Hz.
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wave length
Two sources of sound produce waves differing
by 12m. If the frequencies of sound are 320 Hz and 360 Hz.
Calculate velocity of sound in air?
en wa
arrow_forward
A car of length L = 26 m is moving through the stationary air with a constant velocity V, see the picture
below. At the middle of the car there is a source of sound S, which emits signals in all directions, there are
also two sound detectors D₁ and DŔ at the car's edges.
Which of the detectors will receive the signal earlier? left-edge detector
S
DL
What is the speed of the car if one detector receives signals by 4 msec earlier than the other one? The air
temperature is 18°C.
The speed of the car, V = 342.25413 X Units m/s
Now the car is stationary but there is a 18-m/s wind blowing towards the car, as shown below.
Which of the detectors will receive the sound signal earlier? left-edge detector
S
D₁
DR
The time difference, At =
=
Units ms
DR
What is the time difference in the signal detection between the left and right detectors?
wind
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Task 4
Describe how a complex wave is produced from
sinusoidal waveforms. Give an example to demonstrate
your work. Your answer should include annotated
sketches, equations or other relevant evidence to
demonstrate your ideas.
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