Sound Waves Sound waves are divided into three categories that cover different frequency ranges...
Transcript of Sound Waves Sound waves are divided into three categories that cover different frequency ranges...
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SoundWaves
• Sound waves are divided into three categorie s that cover different frequency ranges– Audible waves
• lie within the range of sensitivity of the human ear
– Infrasonic waves• frequencies below the audible range
– Ultrasonic waves• frequencies above the audible range
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Speed of Sou ndWaves
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Speed of SoundWaves
The speed of sound waves in a medium depends on the compressibility and density of the medium
B: bulk modulus : density of the medium
The speed of sound also depends on the temperature of the medium
331 m/s is the speed of sound in air at0°CTC is the air temperature in degrees Celsius
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ExampleExample
• Find the speed of sound in water, which ha s a bulk modulus of21. 109 N/m2 at a temperature of 0 ° C and a den
sity of 100. x 103 kg/m3.
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Periodic SoundWaves• C ompression
– High- pressure or c ompressed region• T he pressure and density in this region fall above their
equilibrium
• Rarefactions– Low- pressure regions
• T he pressure and density in this region fall below theirequilibrium
• Both regions move with a speed equal to th e speed of sound in the medium
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: the position of a small element relative to i ts equilibrium position
or harmonic position function
: the maximum position of the element relat ive to equilibrium
or displacement amplitude
Periodic SoundWaves
( , )s x t
maxs
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: the gas pressure measured from the equili brium value
: pressure amplitude
Periodic SoundWaves
P
maxP
the pressure wave is 90° out of phase with the displacement wave
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Intensity of Periodic Soun dWaves
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Intensity of Periodic Soun dWaves
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Intensity of Periodic Soun dWaves
Intensity (I): the power per unit area or the rate at which the energy being transported by the wave transfers through a unit area A perpendicular to the direction of travel of the wave
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Intensity of Periodic Soun dWaves
Spherical wave
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Sound Level in Decibels
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ExampleExample
• Two identical machines are p ositioned t he same distance from a worker. The in
tensity of sound delivered by each mac hine at the location of the worker is 2 x
10-7 W/m2.– Find the sound level heard by the worker
• (A) when one machine is operating• (B) when both machines are operating.
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ExampleExample
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Loudness and Frequency
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The Dopple r Effect
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The Doppler Effect
speed of sound, vWavelength, with frequency of the source, f
the speed of the waves relative to the observer, v’
0v v v
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The Doppler Effect
the frequency heard by the observer, f’
0v vvf
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The Doppler Effect
the frequency heard by the observer, f’
0v vvf f
v
+ For observer moving toward source- For observer moving away from source
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The Doppler Effect
the frequency heard by the observer, f’
0v vvf f
v
+ For observer moving toward source- For observer moving away from source
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The Doppler Effect
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The Doppler Effect
T he source in motion and the observer at rest, the frequency heard by th e observer, f’
s
v vf f
v v
+ For source moving away from observer- For source moving toward observer
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ExampleExample• A submarine (sub A) travels through water at a spee
d of 8.00 m/s, emitting a sonar wave at a frequency of 1,400 Hz. The speed of sound in the water is
1,533 m/s. A second submarine (sub B) is located su ch that both submarines are traveling directly towar
d one another. The second s ubmarine is moving at9.00 m/s.– (A) What frequency is detected by an observer riding on
sub B as the subs approach each other ?– (B) The subs barely miss each other and pass. What frequency is detected by an observer riding on sub B
as the subs recede from each other ?
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ExampleExample
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ShockWaves
• speed of a source exceeds the wave
speed• V- shaped wave fr
onts• conical wave fron
t
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ShockWaves
sins s
vt v
v t v
Mach numbervs > v : supersonic speeds
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Superposition• S uperposition principle
– If two or more traveling waves are moving through a medium, the resultant value of
the wave function at any point is the alge braic sum of the values of the wave functi
ons of the individual waves.
• T wo traveling waves can pass through each other without being destroyed or even altered
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Superposition• S uperposition principle
– If two or more traveling waves are moving through a medium, the resultant value of
the wave function at any point is the alge braic sum of the values of the wave functi
ons of the individual waves.
• T wo traveling waves can pass through each other without being destroyed or even altered
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Interference
• Interference– t he combination of separate waves in the
same region of space to produce a result ant wave
• C onstructive interference– the two pulses in the same direction
• D estructive interference– the two pulses in opposite direction
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Superposition
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Superposition
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Superposition of Sinusoid al Waves
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Superposition of Sinusoid al Waves
• C onstructive interference– the resultant wave h
as maximum amplitude
• D estructive interference– the resultant wave h
as zero amplitude
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Interference of SoundWaves
path length
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ExampleExample
• A pair of speakers placed 3.00 m apart are driven by the same oscillator as shown in the figure. A listener is originally at point
O , which is located 8.00 m from the center of the line connecti ng the two speakers. The listener then walks to point P , which i
s a perpendicular distance 0.350 m from O , before reaching the first minimum in sound intensity. What is the frequency of the
oscillator ?
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ExampleExample
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StandingWaves
superposition of two transverse sinusoidal waves having the same amplitude, frequency,
and wavelength but traveling in opposite directi ons in the same medium
wave function of a standing wave
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StandingWaves
Nodes : points of zero displacementA ntinodes : points of maximum displacement
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StandingWaves
Nodes
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StandingWaves
Antinodes
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StandingWaves
• The distance between adjacent antino des is equal to /2
• The distance between adjacent nodes i s equal to /2
• The distance between a node and an a djacent antinode is /4.
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StandingWaves
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StandingWaves in a String Fixed at Both Ends
N ormal modes : a number of natural patterns of oscillation
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StandingWaves in a String Fixed at Both Ends
N atural frequencies of the normal modesor, quantized frequencies
wavelengths of the various normal modes
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StandingWaves in a String Fixed at Both Ends
natural frequencies of a taut string
fundamental frequency
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StandingWaves in a String Fixed at Both Ends
• Harmonics– Frequencies of normal modes that exhibit
- an integer multiple relationship• such as this form a harmonic series, and the no
rmal modes
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StandingWaves in a String Fixed at Both Ends
boundary conditions
At x = 0 and x = L
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StandingWaves in a String Fixed at Both Ends
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Resonance• If a periodic force is applied to such a sy
stem, the amplitude of the r esulting mo tion is greatest when the frequency of t
he applied force is equal to one of the n atural frequencies of the system
• T his phenomenon, known as resonance• T hese frequencies are often referred to
as resonance frequencies
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Resonance
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Resonance
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ExampleExample
• The high E string on a guitar measures 64.0 cm in length and h as a fundamental frequency of 330 Hz. By pressing down so th at the string is in contact with the first fret (as shown in the
figure), the string is shortened so that it plays an F note that h as a frequency of 350 Hz. How far is the fret from the neck end of the string?
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ExampleExample
For fundamental frequency, n = 1
Because we have not adjusted the tuning peg, the tension inthe string, and hence the wave speed, remain constant
distance from the fret to the neck end of the string
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StandingWaves in Air Columns
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StandingWaves in Air Columns
• In a pipe open at both ends, the natural frequencies of oscillation for m a harmonic series that includes all integral multiples of the funda
mental frequency
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StandingWaves in Air Columns
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StandingWaves in Air Columns
• In a pipe closed at one end, the natural frequencies of oscillation for m a harmonic series that includes only odd integral multiples of the
fundamental frequency
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ExampleExample• A simple apparatus for demonstra
ting resonance in an air column is depicted in the f igure. A vertical p
ipe open at both ends is partially s ubmerged in water, and a tuning f
ork vibrating at an unknown frequ ency is placed near the top of the pipe. The length L of the air colum
n can be adjusted by moving the pipe vertically. The sound waves
generated by the fork are reinforc ed when L corresponds to one of t he resonance frequencies of the p
ipe.– For a certain pipe, the smallest va
lue of L for which a peak occurs in the sound intensity is 9.00 cm. Wh
at are• (A) the frequency of the tuning for
k• (B) the values of L for the next two
resonance frequencies ?
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ExampleExample
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Beats: Interference in Time
• interference phenomena– spatial interference.
• Standing waves in strings and pipes
– interference in time or temporal interference• results from the superposition of two waves having sli
ghtly different frequencies– beating
• Beating– the periodic variation in amplitude at a given po
int due to the superposition of two waves havin g slightly different frequencies
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Beats: Interference in Time
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Beats: Interference in Time
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Nonsinusoidal Wave Patterns• The wave patterns produced b
y a musical instrument are the result of the superposition of v arious harmonics
– a musical sound• A listener can assign a pitch to
the sound, based on the funda mental frequency
• Combinations of frequencies that
• are not integer multiples of a fu ndamental result in a noise , rat
her than a musical sound• The human perceptive respons
e associated with various mixt ures of harmonics is the quality
or timbre of the sound
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Nonsinusoidal Wave Patterns
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Nonsinusoidal Wave Patterns
• The corresponding sum of terms that represents the periodic wave pattern
– called a Fourier series
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Nonsinusoidal Wave Patterns
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Nonsinusoidal Wave Patterns
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Nonsinusoidal Wave Patterns