SlideShare a Scribd company logo
Standing Waves on
Strings
Physics 101
What is a Standing Wave?
 A wave that does not appear to travel.
 Created by two harmonic waves of equal amplitude, wavelength and
frequency, moving in opposite directions.
Nodes and Antinodes
 Nodes occur where the amplitude is always zero.
Node Node NodeNode
Nodes and Antinodes
 Antinodes occur where the amplitude moves between -2A and 2A, the
maximum amplitude. (A – amplitude of constituent harmonic waves)
Antinode
Antinode
λ
4
λ
2
3λ
4
λ 5λ
4
λ
2
λ
2
Node to Node
Antinode to Antinode
Nodes and Antinodes
 Consecutive nodes and consecutive antinodes are
𝜆
2
(half a wavelength) apart
 The distance between a node and the nearest antinode is
𝜆
4
.
Nodes and Antinodes
λ
4
λ
2
3λ
4
λ 5λ
4
λ
4
Antinode
to Node
λ
4
Node to
Antinode
Frequency of Standing Waves on Strings
 𝒇 𝒎 =
𝒗
𝝀 𝒎
=
𝒎
𝟐𝑳
𝒗 =
𝒎
𝟐𝑳
𝑻
𝝁
=
𝒎
𝟐𝑳
𝑻
𝑴
𝑳
 m = mode number (1, 2, 3, …) (see next slide)
 v = wave speed
 𝜆 = wavelength
 L = length of string
 T = tension of the string
 M = mass of string
 Recall that 𝜇 is the linear mass density of the string
𝑀
𝐿
.
Normal Modes
 Represented as n in the diagram
 The mode number corresponds to the
number of antinodes on the vibrating string
 A mode of 2 is double the frequency of the
fundamental frequency (n = 1)
 The relationship between the first harmonic
and other harmonics is represented by this
equation:
 𝒇 𝒎 = 𝒎𝒇 𝟏
 m is a positive integer > 0
Harmonics/Resonant Frequencies
 The allowed frequencies represented by the equation:
 𝒇 𝒎 = 𝒎𝒇 𝟏
 In lab 5, you found the fundamental frequency, the lowest frequency that
results in a single antinode at its maximum frequency.
 Knowing the fundamental frequency, we can find the harmonics/resonant
frequencies.
Questions
#1 - The frequency of the fourth
harmonic is…
 A) Same as the frequency of the 2nd harmonic.
 B)
4
3
times greater than the frequency of the 3rd harmonic.
 C) Triple the frequency of the fundamental frequency.
 D) Double the frequency of the 3rd harmonic.
The frequency of the fourth harmonic
is…
 A) Same as the frequency of the 2nd harmonic.
 B)
𝟒
𝟑
times greater than the frequency of the 3rd harmonic.
 C) Triple the frequency of the fundamental frequency.
 D) Double the frequency of the 3rd harmonic.
 𝒂⦁𝒇 𝟑 = 𝒇 𝟒
 𝒂⦁𝟑𝒇 𝟏 = 𝟒𝒇 𝟏
 𝒂 =
𝟒𝒇 𝟏
𝟑𝒇 𝟏
=
𝟒
𝟑
#2 - A guitar string that is plucked produces a
standing wave. Its angular velocity is 5 rad/m.
The amplitude is 8mm. The length the string
vibrating is 40cm. The mass of the string is 0.2g.
The tension of the string is equal to the weight
of a 36kg mass on the moon.
 A) Imagine that the standing wave is produced by two harmonic waves of equal
amplitude, wavelength, and frequency travelling opposite directions. What would
be the amplitude of the two constituent waves?
 B) Write an equation to represent the amplitude of the standing wave.
 C) What is the distance between a node and the nearest antinode?
 D) What is the wave speed in the string?
 E) What is the fifth harmonic?
A guitar string that is plucked produces a standing wave. Its angular velocity is 5
rad/m. The amplitude is 8mm. The length the string vibrating is 40cm. The mass
of the string is 0.2g. The tension of the string is equal to the weight of a 36kg
mass on the moon.
 A) Imagine that the standing wave is produced by two harmonic waves of
equal amplitude, wavelength, and frequency travelling opposite directions.
What would be the amplitude of the two constituent waves?
 The amplitude of the standing wave is double the amplitude of the
constituent wave.
 2A = 8mm
 A = 4mm
A guitar string that is plucked produces a standing wave. Its angular velocity is
5.0 rad/m. The amplitude is 8.0mm. The length the string vibrating is 40cm. The
mass of the string is 0.2g. The tension of the string is equal to the weight of a
36kg mass on the moon.
 B) Write an equation to represent the amplitude of the standing wave.
 A(x) = A sin(ωx)
 A(x) = (8.0 mm)sin(5.0x)
A guitar string that is plucked produces a standing wave. Its angular velocity is 5
rad/m. The amplitude is 8mm. The length the string vibrating is 40cm. The mass
of the string is 0.2g. The tension of the string is equal to the weight of a 36kg
mass on the moon.
 C) What is the distance between a node and the nearest antinode?
 Let us find the distance between nodes.
 Recall from the text (eq 14-44): 𝑥 = 𝑚
𝜆
2
, where m = 0, ±1, ±2, ±3, …
 We know that ω = 5rad/m and ω =
2𝜋
𝜆
 5 =
2𝜋
𝜆
𝜆 =
2𝜋
5
 m = 0  x = 0
 m = 1  x =
𝜆
2
=
2𝜋
2(5)
=
𝜋
5
 m = 2  x = 𝜆 =
2𝜋
5
 (continued on next slide)
A guitar string that is plucked produces a standing wave. Its angular velocity is 5
rad/m. The amplitude is 8mm. The length the string vibrating is 40cm. The mass
of the string is 0.2g. The tension of the string is equal to the weight of a 36kg
mass on the moon.
 C) What is the distance between a node and the nearest antinode?
 The location of the nodes are at: x = 0,
𝜋
5
,
2𝜋
5
, …
 The location of the first antinode is at:
𝜆
4
=
2𝜋
(4)5
=
𝜋
10
 We can find the distance between any node the nearest antinode by finding
the distance between the first node and antinode.
 The first node is at x = 0
 The first antinode is at x =
𝜋
10

𝜋
10
- 0 =
𝝅
𝟏𝟎
A guitar string that is plucked produces a standing wave. Its angular velocity is 5
rad/m. The amplitude is 8mm. The length the string vibrating is 40cm. The mass of
the string is 0.2g. The tension of the string is equal to the weight of a 36kg mass on
the moon.
 D) What is the wave speed in the string?
 𝑣 =
𝑇
𝜇
 𝜇 =
𝑚 𝑠𝑡𝑟𝑖𝑛𝑔
𝐿
=
0.2 𝑥 10−3 𝑘𝑔
0.4𝑚
=
5 𝑥 10−4 𝑘𝑔
𝑚
 𝑇 = 𝑤𝑒𝑖𝑔ℎ𝑡 𝑜𝑓 36𝑘𝑔 𝑚𝑎𝑠𝑠 𝑜𝑛 𝑡ℎ𝑒 𝑚𝑜𝑜𝑛
 𝑊𝑒𝑖𝑔ℎ𝑡 = 𝑚𝑔 𝑚𝑜𝑜𝑛
 𝑔 𝑚𝑜𝑜𝑛 =
1
6
𝑔 𝑒𝑎𝑟𝑡ℎ =
1
6
(9.81
𝑚
𝑠2) = 1.635
𝑚
𝑠2
 𝑇 = 𝑚𝑔 𝑚𝑜𝑜𝑛 = 36𝑘𝑔 1.635
𝑚
𝑠2 = 58.86𝑁
 𝑣 =
58.86
5 𝑥 10−4 = 𝟑𝟒𝟐
𝒎
𝒔
A guitar string that is plucked produces a standing wave. Its angular velocity is 5
rad/m. The amplitude is 8mm. The length the string vibrating is 40cm. The mass of
the string is 0.2g. The tension of the string is equal to the weight of a 36kg mass on
the moon.
 E) What is the fifth harmonic?
 Find the fundamental frequency first.
 𝑣 = 𝜆𝑓
 𝑓1 =
𝑣
𝜆
 𝑣 = 342.34
𝑚
𝑠
 𝜆 = 2𝐿 = 2 0.4𝑚 = 0.8𝑚 𝑎𝑡 𝑓𝑢𝑛𝑑𝑎𝑚𝑒𝑛𝑡𝑎𝑙 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦
 𝑓1 =
342.34
𝑚
𝑠
0.8𝑚
= 427.925Hz
 𝑁𝑜𝑤 𝑤𝑒 𝑐𝑎𝑛 𝑓𝑖𝑛𝑑 𝑡ℎ𝑒 𝑓𝑖𝑓𝑡ℎ ℎ𝑎𝑟𝑚𝑜𝑛𝑖𝑐 𝑢𝑠𝑖𝑛𝑔 𝑡ℎ𝑒 𝑓𝑢𝑛𝑑𝑎𝑚𝑒𝑛𝑡𝑎𝑙 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦.
 𝑓5 = 5𝑓1 = 5 427.925Hz = 𝟐𝟏𝟒𝟎𝐇𝐳
Works Cited
 Wave on a String PhET simulation (wave diagrams)
 https://phet.colorado.edu/en/simulation/wave-on-a-string
 Physics 101 Textbook (definitions and equations)
 Physics for Scientists and Engineers: An Interactive Approach, 1st
Edition
 Robert Hawkes, Javed Iqbal, Firas Mansour, Marina Milner-Bolotin,
and Peter Williams

More Related Content

What's hot

Standing waves
Standing wavesStanding waves
Standing waves
annayys
 
Standing Waves
Standing WavesStanding Waves
Standing Waves
Nathan Monash
 
PHYS101 Learning Object (LO6)
PHYS101 Learning Object (LO6)PHYS101 Learning Object (LO6)
PHYS101 Learning Object (LO6)
CurryJam
 
Standing Waves on Strings
Standing Waves on StringsStanding Waves on Strings
Standing Waves on Strings
jjsoroka
 
Stationary waves
Stationary wavesStationary waves
Stationary waves
sangitaholkar
 
Lo 6 standing waves
Lo 6   standing wavesLo 6   standing waves
Lo 6 standing waves
Adria Lwin
 
Harmonic Waves
Harmonic WavesHarmonic Waves
Harmonic Waves
Ryan Koon
 
Standing Waves
Standing WavesStanding Waves
Standing Waves
snp96
 
Standing Waves on a String
Standing Waves on a StringStanding Waves on a String
Standing Waves on a String
ayshaab
 
Stationary Waves
Stationary WavesStationary Waves
Stationary Waves
sathish sak
 
Waves_and_superposition.pdf
Waves_and_superposition.pdfWaves_and_superposition.pdf
Waves_and_superposition.pdf
peterli493750
 
Learning object lo6
Learning object lo6Learning object lo6
Learning object lo6
yukunfang9
 
Standing waves (lo)
Standing waves (lo)Standing waves (lo)
Standing waves (lo)
Carly Chui
 
IB Physics Standing Waves Flippingphysics by Nothingnerdy
IB Physics Standing Waves Flippingphysics by NothingnerdyIB Physics Standing Waves Flippingphysics by Nothingnerdy
IB Physics Standing Waves Flippingphysics by Nothingnerdy
Nothingnerdy
 
Standing waves on strings
Standing waves on stringsStanding waves on strings
Standing waves on strings
josunah9
 
Wave Motion Theory Part3
Wave Motion Theory Part3Wave Motion Theory Part3
Wave Motion Theory Part3
Lakshmikanta Satapathy
 
Standing Waves LO6 physics 101- Alvin Parappilly
Standing Waves LO6 physics 101- Alvin ParappillyStanding Waves LO6 physics 101- Alvin Parappilly
Standing Waves LO6 physics 101- Alvin Parappilly
Alvin Parappilly
 
Standing waves
Standing waves Standing waves
Standing waves
brigettewee
 
STATIONARY WAVES
STATIONARY WAVESSTATIONARY WAVES
STATIONARY WAVES
KANNAN
 

What's hot (20)

Standing waves
Standing wavesStanding waves
Standing waves
 
Standing Waves
Standing WavesStanding Waves
Standing Waves
 
PHYS101 Learning Object (LO6)
PHYS101 Learning Object (LO6)PHYS101 Learning Object (LO6)
PHYS101 Learning Object (LO6)
 
Standing Waves on Strings
Standing Waves on StringsStanding Waves on Strings
Standing Waves on Strings
 
Stationary waves
Stationary wavesStationary waves
Stationary waves
 
Lo 6 standing waves
Lo 6   standing wavesLo 6   standing waves
Lo 6 standing waves
 
Harmonic Waves
Harmonic WavesHarmonic Waves
Harmonic Waves
 
Standing Waves
Standing WavesStanding Waves
Standing Waves
 
Standing Waves on a String
Standing Waves on a StringStanding Waves on a String
Standing Waves on a String
 
Stationary Waves
Stationary WavesStationary Waves
Stationary Waves
 
Waves_and_superposition.pdf
Waves_and_superposition.pdfWaves_and_superposition.pdf
Waves_and_superposition.pdf
 
Learning object lo6
Learning object lo6Learning object lo6
Learning object lo6
 
Standing waves (lo)
Standing waves (lo)Standing waves (lo)
Standing waves (lo)
 
IB Physics Standing Waves Flippingphysics by Nothingnerdy
IB Physics Standing Waves Flippingphysics by NothingnerdyIB Physics Standing Waves Flippingphysics by Nothingnerdy
IB Physics Standing Waves Flippingphysics by Nothingnerdy
 
Standing waves on strings
Standing waves on stringsStanding waves on strings
Standing waves on strings
 
Wave Motion Theory Part3
Wave Motion Theory Part3Wave Motion Theory Part3
Wave Motion Theory Part3
 
Standing Waves LO6 physics 101- Alvin Parappilly
Standing Waves LO6 physics 101- Alvin ParappillyStanding Waves LO6 physics 101- Alvin Parappilly
Standing Waves LO6 physics 101- Alvin Parappilly
 
Standing waves
Standing waves Standing waves
Standing waves
 
STATIONARY WAVES
STATIONARY WAVESSTATIONARY WAVES
STATIONARY WAVES
 
4.5
4.54.5
4.5
 

Similar to Standing Waves on Strings

Standing waves on Strings
Standing waves on StringsStanding waves on Strings
Standing waves on Strings
Shaireen Cassamali
 
PHYSICS MAHARASHTRA STATE BOARD CHAPTER 6 - SUPERPOSITION OF WAVES EXERCISE S...
PHYSICS MAHARASHTRA STATE BOARD CHAPTER 6 - SUPERPOSITION OF WAVES EXERCISE S...PHYSICS MAHARASHTRA STATE BOARD CHAPTER 6 - SUPERPOSITION OF WAVES EXERCISE S...
PHYSICS MAHARASHTRA STATE BOARD CHAPTER 6 - SUPERPOSITION OF WAVES EXERCISE S...
Pooja M
 
Learning Object- Standing Waves on Strings
Learning Object- Standing Waves on StringsLearning Object- Standing Waves on Strings
Learning Object- Standing Waves on Strings
kendrick24
 
Ch 16 Waves and Sound
Ch 16 Waves and Sound Ch 16 Waves and Sound
Ch 16 Waves and Sound Scott Thomas
 
Lerning objectweek7(lo5) hanahpark
Lerning objectweek7(lo5) hanahparkLerning objectweek7(lo5) hanahpark
Lerning objectweek7(lo5) hanahpark
hanahris
 
SUBJECT: PHYSICS - Chapter 6 : Superposition of waves (CLASS XII - MAHARASH...
 SUBJECT: PHYSICS - Chapter 6 : Superposition of waves  (CLASS XII - MAHARASH... SUBJECT: PHYSICS - Chapter 6 : Superposition of waves  (CLASS XII - MAHARASH...
SUBJECT: PHYSICS - Chapter 6 : Superposition of waves (CLASS XII - MAHARASH...
Pooja M
 
Standing waves on a string
Standing waves on a stringStanding waves on a string
Standing waves on a string
Lauren Rappaport
 
Lo 6 standing wave on a string
Lo 6  standing wave on a stringLo 6  standing wave on a string
Lo 6 standing wave on a string
Jessica Weng
 
Ch 7 physical optics final
Ch 7 physical optics finalCh 7 physical optics final
Ch 7 physical optics final
animesh samundh
 
Chapter 6 - Superposition of waves.pptx
Chapter 6 - Superposition of waves.pptxChapter 6 - Superposition of waves.pptx
Chapter 6 - Superposition of waves.pptx
Pooja M
 
Standwaves
StandwavesStandwaves
Standwaves
mmgwong
 
Physics 17-2
Physics 17-2Physics 17-2
Physics 17-2
M.T.H Group
 
Physics by Younes Sina
Physics by Younes SinaPhysics by Younes Sina
Physics by Younes Sina
Younes Sina
 
Ch7z5eatstructure 110115225106-phpapp02
Ch7z5eatstructure 110115225106-phpapp02Ch7z5eatstructure 110115225106-phpapp02
Ch7z5eatstructure 110115225106-phpapp02
Cleophas Rwemera
 
Standing waves (music)
Standing waves (music)Standing waves (music)
Standing waves (music)
Anonymous0805
 
WAVES-converted.pdfgggghjnhdhbxbdbhdbdbbdhdhb
WAVES-converted.pdfgggghjnhdhbxbdbhdbdbbdhdhbWAVES-converted.pdfgggghjnhdhbxbdbhdbdbbdhdhb
WAVES-converted.pdfgggghjnhdhbxbdbhdbdbbdhdhb
chettanagarwal
 
Chapter 6
Chapter 6Chapter 6
Chapter 6
Lama K Banna
 
Physics LO - Investigation of Standing Waves on Strings (Updated)
 Physics LO - Investigation of Standing Waves on Strings (Updated) Physics LO - Investigation of Standing Waves on Strings (Updated)
Physics LO - Investigation of Standing Waves on Strings (Updated)
joycez14
 
Physics LO - Investigation of Standing Waves on Strings
Physics LO - Investigation of Standing Waves on StringsPhysics LO - Investigation of Standing Waves on Strings
Physics LO - Investigation of Standing Waves on Strings
joycez14
 

Similar to Standing Waves on Strings (20)

Standing waves on Strings
Standing waves on StringsStanding waves on Strings
Standing waves on Strings
 
PHYSICS MAHARASHTRA STATE BOARD CHAPTER 6 - SUPERPOSITION OF WAVES EXERCISE S...
PHYSICS MAHARASHTRA STATE BOARD CHAPTER 6 - SUPERPOSITION OF WAVES EXERCISE S...PHYSICS MAHARASHTRA STATE BOARD CHAPTER 6 - SUPERPOSITION OF WAVES EXERCISE S...
PHYSICS MAHARASHTRA STATE BOARD CHAPTER 6 - SUPERPOSITION OF WAVES EXERCISE S...
 
Learning Object- Standing Waves on Strings
Learning Object- Standing Waves on StringsLearning Object- Standing Waves on Strings
Learning Object- Standing Waves on Strings
 
Ch 16 Waves and Sound
Ch 16 Waves and Sound Ch 16 Waves and Sound
Ch 16 Waves and Sound
 
Lerning objectweek7(lo5) hanahpark
Lerning objectweek7(lo5) hanahparkLerning objectweek7(lo5) hanahpark
Lerning objectweek7(lo5) hanahpark
 
SUBJECT: PHYSICS - Chapter 6 : Superposition of waves (CLASS XII - MAHARASH...
 SUBJECT: PHYSICS - Chapter 6 : Superposition of waves  (CLASS XII - MAHARASH... SUBJECT: PHYSICS - Chapter 6 : Superposition of waves  (CLASS XII - MAHARASH...
SUBJECT: PHYSICS - Chapter 6 : Superposition of waves (CLASS XII - MAHARASH...
 
Standing waves on a string
Standing waves on a stringStanding waves on a string
Standing waves on a string
 
Lo 6 standing wave on a string
Lo 6  standing wave on a stringLo 6  standing wave on a string
Lo 6 standing wave on a string
 
Ch 7 physical optics final
Ch 7 physical optics finalCh 7 physical optics final
Ch 7 physical optics final
 
Chapter 6 - Superposition of waves.pptx
Chapter 6 - Superposition of waves.pptxChapter 6 - Superposition of waves.pptx
Chapter 6 - Superposition of waves.pptx
 
Standwaves
StandwavesStandwaves
Standwaves
 
Physics 17-2
Physics 17-2Physics 17-2
Physics 17-2
 
Physics by Younes Sina
Physics by Younes SinaPhysics by Younes Sina
Physics by Younes Sina
 
Ch7z5eatstructure 110115225106-phpapp02
Ch7z5eatstructure 110115225106-phpapp02Ch7z5eatstructure 110115225106-phpapp02
Ch7z5eatstructure 110115225106-phpapp02
 
Standing waves (music)
Standing waves (music)Standing waves (music)
Standing waves (music)
 
WAVES-converted.pdfgggghjnhdhbxbdbhdbdbbdhdhb
WAVES-converted.pdfgggghjnhdhbxbdbhdbdbbdhdhbWAVES-converted.pdfgggghjnhdhbxbdbhdbdbbdhdhb
WAVES-converted.pdfgggghjnhdhbxbdbhdbdbbdhdhb
 
Chapter 6
Chapter 6Chapter 6
Chapter 6
 
Physics LO - Investigation of Standing Waves on Strings (Updated)
 Physics LO - Investigation of Standing Waves on Strings (Updated) Physics LO - Investigation of Standing Waves on Strings (Updated)
Physics LO - Investigation of Standing Waves on Strings (Updated)
 
Physics LO - Investigation of Standing Waves on Strings
Physics LO - Investigation of Standing Waves on StringsPhysics LO - Investigation of Standing Waves on Strings
Physics LO - Investigation of Standing Waves on Strings
 
Waves.pptx
Waves.pptxWaves.pptx
Waves.pptx
 

Recently uploaded

Lab report on liquid viscosity of glycerin
Lab report on liquid viscosity of glycerinLab report on liquid viscosity of glycerin
Lab report on liquid viscosity of glycerin
ossaicprecious19
 
Orion Air Quality Monitoring Systems - CWS
Orion Air Quality Monitoring Systems - CWSOrion Air Quality Monitoring Systems - CWS
Orion Air Quality Monitoring Systems - CWS
Columbia Weather Systems
 
general properties of oerganologametal.ppt
general properties of oerganologametal.pptgeneral properties of oerganologametal.ppt
general properties of oerganologametal.ppt
IqrimaNabilatulhusni
 
Comparative structure of adrenal gland in vertebrates
Comparative structure of adrenal gland in vertebratesComparative structure of adrenal gland in vertebrates
Comparative structure of adrenal gland in vertebrates
sachin783648
 
Structural Classification Of Protein (SCOP)
Structural Classification Of Protein  (SCOP)Structural Classification Of Protein  (SCOP)
Structural Classification Of Protein (SCOP)
aishnasrivastava
 
platelets_clotting_biogenesis.clot retractionpptx
platelets_clotting_biogenesis.clot retractionpptxplatelets_clotting_biogenesis.clot retractionpptx
platelets_clotting_biogenesis.clot retractionpptx
muralinath2
 
Unveiling the Energy Potential of Marshmallow Deposits.pdf
Unveiling the Energy Potential of Marshmallow Deposits.pdfUnveiling the Energy Potential of Marshmallow Deposits.pdf
Unveiling the Energy Potential of Marshmallow Deposits.pdf
Erdal Coalmaker
 
justice-and-fairness-ethics with example
justice-and-fairness-ethics with examplejustice-and-fairness-ethics with example
justice-and-fairness-ethics with example
azzyixes
 
The ASGCT Annual Meeting was packed with exciting progress in the field advan...
The ASGCT Annual Meeting was packed with exciting progress in the field advan...The ASGCT Annual Meeting was packed with exciting progress in the field advan...
The ASGCT Annual Meeting was packed with exciting progress in the field advan...
Health Advances
 
Lateral Ventricles.pdf very easy good diagrams comprehensive
Lateral Ventricles.pdf very easy good diagrams comprehensiveLateral Ventricles.pdf very easy good diagrams comprehensive
Lateral Ventricles.pdf very easy good diagrams comprehensive
silvermistyshot
 
(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...
(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...
(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...
Scintica Instrumentation
 
Citrus Greening Disease and its Management
Citrus Greening Disease and its ManagementCitrus Greening Disease and its Management
Citrus Greening Disease and its Management
subedisuryaofficial
 
extra-chromosomal-inheritance[1].pptx.pdfpdf
extra-chromosomal-inheritance[1].pptx.pdfpdfextra-chromosomal-inheritance[1].pptx.pdfpdf
extra-chromosomal-inheritance[1].pptx.pdfpdf
DiyaBiswas10
 
platelets- lifespan -Clot retraction-disorders.pptx
platelets- lifespan -Clot retraction-disorders.pptxplatelets- lifespan -Clot retraction-disorders.pptx
platelets- lifespan -Clot retraction-disorders.pptx
muralinath2
 
RNA INTERFERENCE: UNRAVELING GENETIC SILENCING
RNA INTERFERENCE: UNRAVELING GENETIC SILENCINGRNA INTERFERENCE: UNRAVELING GENETIC SILENCING
RNA INTERFERENCE: UNRAVELING GENETIC SILENCING
AADYARAJPANDEY1
 
Nutraceutical market, scope and growth: Herbal drug technology
Nutraceutical market, scope and growth: Herbal drug technologyNutraceutical market, scope and growth: Herbal drug technology
Nutraceutical market, scope and growth: Herbal drug technology
Lokesh Patil
 
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.
Sérgio Sacani
 
Cancer cell metabolism: special Reference to Lactate Pathway
Cancer cell metabolism: special Reference to Lactate PathwayCancer cell metabolism: special Reference to Lactate Pathway
Cancer cell metabolism: special Reference to Lactate Pathway
AADYARAJPANDEY1
 
Mammalian Pineal Body Structure and Also Functions
Mammalian Pineal Body Structure and Also FunctionsMammalian Pineal Body Structure and Also Functions
Mammalian Pineal Body Structure and Also Functions
YOGESH DOGRA
 
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...
Sérgio Sacani
 

Recently uploaded (20)

Lab report on liquid viscosity of glycerin
Lab report on liquid viscosity of glycerinLab report on liquid viscosity of glycerin
Lab report on liquid viscosity of glycerin
 
Orion Air Quality Monitoring Systems - CWS
Orion Air Quality Monitoring Systems - CWSOrion Air Quality Monitoring Systems - CWS
Orion Air Quality Monitoring Systems - CWS
 
general properties of oerganologametal.ppt
general properties of oerganologametal.pptgeneral properties of oerganologametal.ppt
general properties of oerganologametal.ppt
 
Comparative structure of adrenal gland in vertebrates
Comparative structure of adrenal gland in vertebratesComparative structure of adrenal gland in vertebrates
Comparative structure of adrenal gland in vertebrates
 
Structural Classification Of Protein (SCOP)
Structural Classification Of Protein  (SCOP)Structural Classification Of Protein  (SCOP)
Structural Classification Of Protein (SCOP)
 
platelets_clotting_biogenesis.clot retractionpptx
platelets_clotting_biogenesis.clot retractionpptxplatelets_clotting_biogenesis.clot retractionpptx
platelets_clotting_biogenesis.clot retractionpptx
 
Unveiling the Energy Potential of Marshmallow Deposits.pdf
Unveiling the Energy Potential of Marshmallow Deposits.pdfUnveiling the Energy Potential of Marshmallow Deposits.pdf
Unveiling the Energy Potential of Marshmallow Deposits.pdf
 
justice-and-fairness-ethics with example
justice-and-fairness-ethics with examplejustice-and-fairness-ethics with example
justice-and-fairness-ethics with example
 
The ASGCT Annual Meeting was packed with exciting progress in the field advan...
The ASGCT Annual Meeting was packed with exciting progress in the field advan...The ASGCT Annual Meeting was packed with exciting progress in the field advan...
The ASGCT Annual Meeting was packed with exciting progress in the field advan...
 
Lateral Ventricles.pdf very easy good diagrams comprehensive
Lateral Ventricles.pdf very easy good diagrams comprehensiveLateral Ventricles.pdf very easy good diagrams comprehensive
Lateral Ventricles.pdf very easy good diagrams comprehensive
 
(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...
(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...
(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...
 
Citrus Greening Disease and its Management
Citrus Greening Disease and its ManagementCitrus Greening Disease and its Management
Citrus Greening Disease and its Management
 
extra-chromosomal-inheritance[1].pptx.pdfpdf
extra-chromosomal-inheritance[1].pptx.pdfpdfextra-chromosomal-inheritance[1].pptx.pdfpdf
extra-chromosomal-inheritance[1].pptx.pdfpdf
 
platelets- lifespan -Clot retraction-disorders.pptx
platelets- lifespan -Clot retraction-disorders.pptxplatelets- lifespan -Clot retraction-disorders.pptx
platelets- lifespan -Clot retraction-disorders.pptx
 
RNA INTERFERENCE: UNRAVELING GENETIC SILENCING
RNA INTERFERENCE: UNRAVELING GENETIC SILENCINGRNA INTERFERENCE: UNRAVELING GENETIC SILENCING
RNA INTERFERENCE: UNRAVELING GENETIC SILENCING
 
Nutraceutical market, scope and growth: Herbal drug technology
Nutraceutical market, scope and growth: Herbal drug technologyNutraceutical market, scope and growth: Herbal drug technology
Nutraceutical market, scope and growth: Herbal drug technology
 
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.
 
Cancer cell metabolism: special Reference to Lactate Pathway
Cancer cell metabolism: special Reference to Lactate PathwayCancer cell metabolism: special Reference to Lactate Pathway
Cancer cell metabolism: special Reference to Lactate Pathway
 
Mammalian Pineal Body Structure and Also Functions
Mammalian Pineal Body Structure and Also FunctionsMammalian Pineal Body Structure and Also Functions
Mammalian Pineal Body Structure and Also Functions
 
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...
 

Standing Waves on Strings

  • 2. What is a Standing Wave?  A wave that does not appear to travel.  Created by two harmonic waves of equal amplitude, wavelength and frequency, moving in opposite directions.
  • 3. Nodes and Antinodes  Nodes occur where the amplitude is always zero. Node Node NodeNode
  • 4. Nodes and Antinodes  Antinodes occur where the amplitude moves between -2A and 2A, the maximum amplitude. (A – amplitude of constituent harmonic waves) Antinode Antinode
  • 5. λ 4 λ 2 3λ 4 λ 5λ 4 λ 2 λ 2 Node to Node Antinode to Antinode Nodes and Antinodes  Consecutive nodes and consecutive antinodes are 𝜆 2 (half a wavelength) apart
  • 6.  The distance between a node and the nearest antinode is 𝜆 4 . Nodes and Antinodes λ 4 λ 2 3λ 4 λ 5λ 4 λ 4 Antinode to Node λ 4 Node to Antinode
  • 7. Frequency of Standing Waves on Strings  𝒇 𝒎 = 𝒗 𝝀 𝒎 = 𝒎 𝟐𝑳 𝒗 = 𝒎 𝟐𝑳 𝑻 𝝁 = 𝒎 𝟐𝑳 𝑻 𝑴 𝑳  m = mode number (1, 2, 3, …) (see next slide)  v = wave speed  𝜆 = wavelength  L = length of string  T = tension of the string  M = mass of string  Recall that 𝜇 is the linear mass density of the string 𝑀 𝐿 .
  • 8. Normal Modes  Represented as n in the diagram  The mode number corresponds to the number of antinodes on the vibrating string  A mode of 2 is double the frequency of the fundamental frequency (n = 1)  The relationship between the first harmonic and other harmonics is represented by this equation:  𝒇 𝒎 = 𝒎𝒇 𝟏  m is a positive integer > 0
  • 9. Harmonics/Resonant Frequencies  The allowed frequencies represented by the equation:  𝒇 𝒎 = 𝒎𝒇 𝟏  In lab 5, you found the fundamental frequency, the lowest frequency that results in a single antinode at its maximum frequency.  Knowing the fundamental frequency, we can find the harmonics/resonant frequencies.
  • 11. #1 - The frequency of the fourth harmonic is…  A) Same as the frequency of the 2nd harmonic.  B) 4 3 times greater than the frequency of the 3rd harmonic.  C) Triple the frequency of the fundamental frequency.  D) Double the frequency of the 3rd harmonic.
  • 12. The frequency of the fourth harmonic is…  A) Same as the frequency of the 2nd harmonic.  B) 𝟒 𝟑 times greater than the frequency of the 3rd harmonic.  C) Triple the frequency of the fundamental frequency.  D) Double the frequency of the 3rd harmonic.  𝒂⦁𝒇 𝟑 = 𝒇 𝟒  𝒂⦁𝟑𝒇 𝟏 = 𝟒𝒇 𝟏  𝒂 = 𝟒𝒇 𝟏 𝟑𝒇 𝟏 = 𝟒 𝟑
  • 13. #2 - A guitar string that is plucked produces a standing wave. Its angular velocity is 5 rad/m. The amplitude is 8mm. The length the string vibrating is 40cm. The mass of the string is 0.2g. The tension of the string is equal to the weight of a 36kg mass on the moon.  A) Imagine that the standing wave is produced by two harmonic waves of equal amplitude, wavelength, and frequency travelling opposite directions. What would be the amplitude of the two constituent waves?  B) Write an equation to represent the amplitude of the standing wave.  C) What is the distance between a node and the nearest antinode?  D) What is the wave speed in the string?  E) What is the fifth harmonic?
  • 14. A guitar string that is plucked produces a standing wave. Its angular velocity is 5 rad/m. The amplitude is 8mm. The length the string vibrating is 40cm. The mass of the string is 0.2g. The tension of the string is equal to the weight of a 36kg mass on the moon.  A) Imagine that the standing wave is produced by two harmonic waves of equal amplitude, wavelength, and frequency travelling opposite directions. What would be the amplitude of the two constituent waves?  The amplitude of the standing wave is double the amplitude of the constituent wave.  2A = 8mm  A = 4mm
  • 15. A guitar string that is plucked produces a standing wave. Its angular velocity is 5.0 rad/m. The amplitude is 8.0mm. The length the string vibrating is 40cm. The mass of the string is 0.2g. The tension of the string is equal to the weight of a 36kg mass on the moon.  B) Write an equation to represent the amplitude of the standing wave.  A(x) = A sin(ωx)  A(x) = (8.0 mm)sin(5.0x)
  • 16. A guitar string that is plucked produces a standing wave. Its angular velocity is 5 rad/m. The amplitude is 8mm. The length the string vibrating is 40cm. The mass of the string is 0.2g. The tension of the string is equal to the weight of a 36kg mass on the moon.  C) What is the distance between a node and the nearest antinode?  Let us find the distance between nodes.  Recall from the text (eq 14-44): 𝑥 = 𝑚 𝜆 2 , where m = 0, ±1, ±2, ±3, …  We know that ω = 5rad/m and ω = 2𝜋 𝜆  5 = 2𝜋 𝜆 𝜆 = 2𝜋 5  m = 0  x = 0  m = 1  x = 𝜆 2 = 2𝜋 2(5) = 𝜋 5  m = 2  x = 𝜆 = 2𝜋 5  (continued on next slide)
  • 17. A guitar string that is plucked produces a standing wave. Its angular velocity is 5 rad/m. The amplitude is 8mm. The length the string vibrating is 40cm. The mass of the string is 0.2g. The tension of the string is equal to the weight of a 36kg mass on the moon.  C) What is the distance between a node and the nearest antinode?  The location of the nodes are at: x = 0, 𝜋 5 , 2𝜋 5 , …  The location of the first antinode is at: 𝜆 4 = 2𝜋 (4)5 = 𝜋 10  We can find the distance between any node the nearest antinode by finding the distance between the first node and antinode.  The first node is at x = 0  The first antinode is at x = 𝜋 10  𝜋 10 - 0 = 𝝅 𝟏𝟎
  • 18. A guitar string that is plucked produces a standing wave. Its angular velocity is 5 rad/m. The amplitude is 8mm. The length the string vibrating is 40cm. The mass of the string is 0.2g. The tension of the string is equal to the weight of a 36kg mass on the moon.  D) What is the wave speed in the string?  𝑣 = 𝑇 𝜇  𝜇 = 𝑚 𝑠𝑡𝑟𝑖𝑛𝑔 𝐿 = 0.2 𝑥 10−3 𝑘𝑔 0.4𝑚 = 5 𝑥 10−4 𝑘𝑔 𝑚  𝑇 = 𝑤𝑒𝑖𝑔ℎ𝑡 𝑜𝑓 36𝑘𝑔 𝑚𝑎𝑠𝑠 𝑜𝑛 𝑡ℎ𝑒 𝑚𝑜𝑜𝑛  𝑊𝑒𝑖𝑔ℎ𝑡 = 𝑚𝑔 𝑚𝑜𝑜𝑛  𝑔 𝑚𝑜𝑜𝑛 = 1 6 𝑔 𝑒𝑎𝑟𝑡ℎ = 1 6 (9.81 𝑚 𝑠2) = 1.635 𝑚 𝑠2  𝑇 = 𝑚𝑔 𝑚𝑜𝑜𝑛 = 36𝑘𝑔 1.635 𝑚 𝑠2 = 58.86𝑁  𝑣 = 58.86 5 𝑥 10−4 = 𝟑𝟒𝟐 𝒎 𝒔
  • 19. A guitar string that is plucked produces a standing wave. Its angular velocity is 5 rad/m. The amplitude is 8mm. The length the string vibrating is 40cm. The mass of the string is 0.2g. The tension of the string is equal to the weight of a 36kg mass on the moon.  E) What is the fifth harmonic?  Find the fundamental frequency first.  𝑣 = 𝜆𝑓  𝑓1 = 𝑣 𝜆  𝑣 = 342.34 𝑚 𝑠  𝜆 = 2𝐿 = 2 0.4𝑚 = 0.8𝑚 𝑎𝑡 𝑓𝑢𝑛𝑑𝑎𝑚𝑒𝑛𝑡𝑎𝑙 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦  𝑓1 = 342.34 𝑚 𝑠 0.8𝑚 = 427.925Hz  𝑁𝑜𝑤 𝑤𝑒 𝑐𝑎𝑛 𝑓𝑖𝑛𝑑 𝑡ℎ𝑒 𝑓𝑖𝑓𝑡ℎ ℎ𝑎𝑟𝑚𝑜𝑛𝑖𝑐 𝑢𝑠𝑖𝑛𝑔 𝑡ℎ𝑒 𝑓𝑢𝑛𝑑𝑎𝑚𝑒𝑛𝑡𝑎𝑙 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦.  𝑓5 = 5𝑓1 = 5 427.925Hz = 𝟐𝟏𝟒𝟎𝐇𝐳
  • 20. Works Cited  Wave on a String PhET simulation (wave diagrams)  https://phet.colorado.edu/en/simulation/wave-on-a-string  Physics 101 Textbook (definitions and equations)  Physics for Scientists and Engineers: An Interactive Approach, 1st Edition  Robert Hawkes, Javed Iqbal, Firas Mansour, Marina Milner-Bolotin, and Peter Williams