Standing waves can form in air columns when they are excited by a sound source. The document discusses standing waves in air columns that are closed at one end or open at both ends. It provides the equations to calculate the fundamental frequency and higher harmonics or overtones based on the length of the air column and speed of sound. Examples are given of different instruments that function as air columns, and practice problems are provided to apply the concepts.
Kinetic Gas Theory including Ideal Gas Equation. Temperature, Volume, Applications
Boyle's Law, Charles' Law and Avogadro's Law. Ideal Gas Theory, Dalton's Partial Pressure
Kinetic Gas Theory including Ideal Gas Equation. Temperature, Volume, Applications
Boyle's Law, Charles' Law and Avogadro's Law. Ideal Gas Theory, Dalton's Partial Pressure
Presentation on Friction (Static, Kinetic and Co-efficient of Friction)Md. Sirajul Islam
Friction is an important term, By this presentation I have learned lot about friction, types of friction, major types, application of friction, static and kinetic friction, law of friction, Co efficient of frictions.
I think this all information help you all to understand friction. This information is given by lot of legal sites.
The objective of this study is to understand the mixing elbow problem.
• Calculate Velocity distribution over bend pipe.
• Calculate Temperature destruction between fluids.
• Calculate and understand pressure distribution over bend
pipe
Electromagnetic radiation consists of photons, the quanta of electromagnetic fields. A freely-propagating photon in empty space (gravity-free, zero curvature vacuum) is described as a self-sustaining, helical traveling wave packet of quantized spin angular momentum moving at the speed of light. A photon is categorized as a stable, massless boson having no electric charge with spin angular momentum s = +/- hbar. The spin axis is aligned with the direction of wave vector k in either the forward or backward direction depending on helicity.
The observed EM frequency spectrum spans more than 140 octaves or ~24 orders of magnitude. The cutoff frequency of the vacuum is taken as the Planck frequency fsubP = 1.855E43 Hz.
My Learning object describes what standing waves are, how to determine where the nodes and antinodes of a standing wave are and also about the fundamental and resonant frequencies. Their is a variety of questions from multiple choice, to true and false and also a problem solving question.
Sound waves are produced by the vibration of material objects. A disturbance in the form of a longitudinal wave travels away from the vibrating source. High-pitched sounds are produced by sources vibrating at high frequency, while low-pitched sounds are produced by low-frequency sources Sound waves consist of traveling pulses of high-pressure zones, or compression, alternating with pulses of low-pressures zones, or rarefaction. Sound can travel through gases, liquids, and solid, but not through a vacuum.
Presentation on Friction (Static, Kinetic and Co-efficient of Friction)Md. Sirajul Islam
Friction is an important term, By this presentation I have learned lot about friction, types of friction, major types, application of friction, static and kinetic friction, law of friction, Co efficient of frictions.
I think this all information help you all to understand friction. This information is given by lot of legal sites.
The objective of this study is to understand the mixing elbow problem.
• Calculate Velocity distribution over bend pipe.
• Calculate Temperature destruction between fluids.
• Calculate and understand pressure distribution over bend
pipe
Electromagnetic radiation consists of photons, the quanta of electromagnetic fields. A freely-propagating photon in empty space (gravity-free, zero curvature vacuum) is described as a self-sustaining, helical traveling wave packet of quantized spin angular momentum moving at the speed of light. A photon is categorized as a stable, massless boson having no electric charge with spin angular momentum s = +/- hbar. The spin axis is aligned with the direction of wave vector k in either the forward or backward direction depending on helicity.
The observed EM frequency spectrum spans more than 140 octaves or ~24 orders of magnitude. The cutoff frequency of the vacuum is taken as the Planck frequency fsubP = 1.855E43 Hz.
My Learning object describes what standing waves are, how to determine where the nodes and antinodes of a standing wave are and also about the fundamental and resonant frequencies. Their is a variety of questions from multiple choice, to true and false and also a problem solving question.
Sound waves are produced by the vibration of material objects. A disturbance in the form of a longitudinal wave travels away from the vibrating source. High-pitched sounds are produced by sources vibrating at high frequency, while low-pitched sounds are produced by low-frequency sources Sound waves consist of traveling pulses of high-pressure zones, or compression, alternating with pulses of low-pressures zones, or rarefaction. Sound can travel through gases, liquids, and solid, but not through a vacuum.
SymEx 2015 - Turning Risks Into Results, A Wider Perspective to Understand P...PMI Indonesia Chapter
From Enron and WorldCom to the more recent financial crisis, events of the last decade have fundamentally shifted how organizations think about risk. Companies around the world have made substantial investments in personnel, processes and technology to help mitigate and control business risk. Historically, these risk investments have focused primarily on financial controls and regulatory compliance. However, these investments have often not addressed more strategic business risk areas. As a result, senior executives may not perceive risk management as strategic to the enterprise. Senior executives also may not have sufficient confidence in their ability to identify and address the risks that could impact the financial performance − or even the viability — of their organization. A strategic question presents itself: “Do organizations with more mature risk management practices outperform their peers financially?” Our research and experience tend to suggest “yes!”
In this presentation, Isnaeni Achdiat will also discuss how leading organization with higher maturity in managing risks, gets better return. We will also present the new paradigm of dealing with risks, either it is good or bad risks. We will introduce the concept of "risk that matters" in an organization and discuss approach to mitigate. Furthermore, we will present the linkage between strategic and project risks and how a good risk culture can impact the success of organization managing their risks. By analyzing the relationship between the strategic and project risks, the project professionals can better understand the setting priorities the boards make, and thus can anticipate allocation of resources at the optimum level, for the benefit of the enterprise. Managing project risks, without understanding context and background of the initial strategic decision, will not allow the project professionals to understand why top management put on-hold the project, or keep it running at the right speed.
SymEx 2015 - Delivering Transformation in Infrastructure Portfolio/Business t...PMI Indonesia Chapter
Indonesia’s GDP is estimated to grow by 5.5% per annum between 2015-2018 and the country is expected to become the 5th largest economy in the world (Source: Standard Chartered, the Super-Cycle Report, 2010). To achieve such growth and be aligned with the exponential population growth, Indonesia requires to work around its limitation to accelerate development of its infrastructure. Basic change management model is reviewed to be inadequate and it is required a strategic and effective change management approach to achieve the target.
The presentation by Rainier Haryanto describes background of thoughts and the methodology for strategic change management adopted to present to achieve the required transformation as mentioned on the above overview. Moreover, some transformations, which are already implemented by the Government of Indonesia for the infrastructure delivery, are also presented.
CBSE Physics/ Lakshmikanta Satapathy/ Wave motion/ Vibration of air columns/ Open & closed pipes/ Fundamental frequency & overtones/ End correction/ Resonance tube
it is about a chapter and learning this chapter is very important for class 8 and further standerds. it contains about sound,eye,ear, and its parts .all the best for your exams
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
1. Lesson #6Lesson #6
Standing Waves in an Air Column
Nelson Reference Pages:457-458Nelson Reference Pages:457-458
(Nelson does not cover all topics)(Nelson does not cover all topics)
McGraw-Hill Reference Pages: 390-398McGraw-Hill Reference Pages: 390-398
2. Forming a Standing Wave in an Air
Column Closed at One End
If you have ever blown into aIf you have ever blown into a
pop bottle and heard apop bottle and heard a
humming sound, then you havehumming sound, then you have
created a standing wave in ancreated a standing wave in an
AC. The following diagramAC. The following diagram
shows how the wave formedshows how the wave formed
can be represented.can be represented. Antinodes
represent high and lowrepresent high and low
pressure (compression &pressure (compression &
rarefaction) andrarefaction) and nodes
represent normal (& constant)represent normal (& constant)
pressure.pressure.
L
A ir C o lu m n C lo s e d
a t O n e E n d
A n t in o d e
N o d e
3. If we try to relate theIf we try to relate the
length of the AC tolength of the AC to λλ, we, we
would getwould get λλ = __ L. This= __ L. This
is lowest naturalis lowest natural
frequency that canfrequency that can
occur. It is calledoccur. It is called
_________ frequency or_________ frequency or
________ harmonic.________ harmonic.
We can see why this isWe can see why this is
true from the diagram.true from the diagram.
Note, the wave does notNote, the wave does not
extend out of the AC asextend out of the AC as
shown in the diagram.shown in the diagram.
L
A c o m p le t e
w a v e is s h o w n
4. Other Resonant Lengths for the Same
Frequency
We will modify the previous drawingWe will modify the previous drawing
to show how we can determine theto show how we can determine the
next resonant length for thenext resonant length for the same
frequency.frequency.
We know that there must be anWe know that there must be an
antinode at the opening whichantinode at the opening which
required addingrequired adding ½ λ
The equation for other resonantThe equation for other resonant
lengths (for same f andlengths (for same f and λλ) would be:) would be:
Ln = (2n -1) ¼λ, n = 1,2,…
Here, when n = 1 we have the shortestHere, when n = 1 we have the shortest
length and this corresponds to thelength and this corresponds to the
fundamental frequency (firstfundamental frequency (first
harmonic).harmonic).
L
A c o m p le t e
w a v e is s h o w n
3 L
5. Other Natural Frequencies for a
Given Length of AC Closed @ 1 End
Not all harmonics occur in a closed AC, onlyNot all harmonics occur in a closed AC, only
the odd numbered ones; 1,3,5.. This is whythe odd numbered ones; 1,3,5.. This is why
the Fthe Fnn equation at the bottom has “2n-1”equation at the bottom has “2n-1”
which only gives an odd number when “n” iswhich only gives an odd number when “n” is
a positive integer.a positive integer.
Purple represents the fundamental frepresents the fundamental f11. We. We
know that v=fknow that v=f λλ, so f, so f11 =v /=v / λλ, but, but λλ = 4L, so f= 4L, so f11
= v/(4L)= v/(4L)
Green represents therepresents the second overtoneovertone (or 3rd
harmonic). We can see that L = ¾We can see that L = ¾ λλ, so, so λλ
= (4/3) L and f = v /((4/3)L) = ¾ v/L= (4/3) L and f = v /((4/3)L) = ¾ v/L
Blue represents therepresents the 4th
OTOT (or 5th
harmonic).
The general equation is:The general equation is:
Fn = (2n-1) x f1 , n = 1,2,… think of “n” as
representing the next lowest natural
frequency that will occur (it is NOT the
harmonic number – which equals “2n-1” ). L
6. Example Problem
A train whistle has a length of 0.600 m andA train whistle has a length of 0.600 m and
is closed at one end. If air temp. is 15is closed at one end. If air temp. is 1500
C,C,
determine the three lowest resonantdetermine the three lowest resonant
frequencies.frequencies.
Ans: ff1 = 142 Hz,= 142 Hz, ff2 = 425 Hz,= 425 Hz, ff3 = 708 Hz= 708 Hz
Here, f2 would be the 2nd
lowest natural
frequency but represents the 3rd
harmonic,
similarly f3 would be the 3rd
lowest natural
frequency but represent the 5th
harmonic.
(Note: 2nd
and 4th
harmonics can not form in
the closed AC)
7. AC Opened at Both Ends
From the diagram, we can see thatFrom the diagram, we can see that
an antinode (an antinode (A) must occur at each) must occur at each
end.end.
For the fundamental frequency (fFor the fundamental frequency (f11),), λλ
= __ L. We can see that for the next= __ L. We can see that for the next
resonant length (Lresonant length (L22), __), __ λλ must bemust be
added to the initial length (Ladded to the initial length (L11) of the) of the
AC. The equation for the resonantAC. The equation for the resonant
lengths is:lengths is:
Ln = n x ½ λ, n = 1, 2,…
(Where L1 is the shortest length and
results in the fundamental frequency
– see diagram)
A C o p e n e d a t
b o t h e n d s .L
A
N
A
8. Three Lowest Natural Frequencies for
a Given Length of Open AC
Again we use theAgain we use the
fundamental wave equation,fundamental wave equation,
wherewhere v is a constant for ais a constant for a
given temperature. For thegiven temperature. For the
first OT,first OT, λ is now half ofis now half of
what it was forwhat it was for f1 , this means, this means
that fthat f22 must bemust be 2 x f1..
SimilarlySimilarly F3 = 3f1..
The equation for naturalThe equation for natural
frequencies for a givenfrequencies for a given
length is:length is:
Fn = n x f1 , n = 1,2,..
L F u n d a m e n t a l
1 s t O v e r t o n e
2 n d O v e r t o n e
9. Examples of AC’s
Examples of Open AC’s: At the CNE,Examples of Open AC’s: At the CNE,
some prizes have been plastic tubes thatsome prizes have been plastic tubes that
you whirl above your head. These areyou whirl above your head. These are
open at both ends. A bugle flute is also anopen at both ends. A bugle flute is also an
open AC.open AC.
Reed instruments such as clarinet, oboe,Reed instruments such as clarinet, oboe,
bassoon, behave like an AC closed at onebassoon, behave like an AC closed at one
end.end.
10. Practice Problems
The following website explains how pressure wavesThe following website explains how pressure waves
(compression & rarefaction) occur in a closed AC. It also(compression & rarefaction) occur in a closed AC. It also
explains why only odd numbered harmonics occur (1,3,5…)explains why only odd numbered harmonics occur (1,3,5…)
http://www.webtech.buffalo.edu/student/m3_digimusic/02_documents/sound_wave/MusicInstruments_ClosedEn
Nelson TB: Page 460 #7, 8, 9, 10Page 460 #7, 8, 9, 10
Questions from the McGraw-Hill TB (Page 396)
1. A hollow plastic pipe is almost completely submerged in a1. A hollow plastic pipe is almost completely submerged in a
graduated cylinder full of water, and a vibrating tuning forkgraduated cylinder full of water, and a vibrating tuning fork
is held over its open end. The pipe is slowly raised from theis held over its open end. The pipe is slowly raised from the
water. An increase in loudness of the sound is heard whenwater. An increase in loudness of the sound is heard when
the pipe has been raisedthe pipe has been raised 17 cm and then raised byand then raised by 51 cm..
a.a. What does an increase in loudness represent?What does an increase in loudness represent? (Ask)
b.b. Determine the wavelength of the sound produced.Determine the wavelength of the sound produced. (68cm)
c.c. If the pipe continues to be raised, how far is the top of theIf the pipe continues to be raised, how far is the top of the
pipe from the water when the next increase in loudness ispipe from the water when the next increase in loudness is
heard?heard? (85cm)
11. 2. The first resonant length of an air column
resonating to a fixed frequency is 32 cm.
a. Determine L2 and L3 if the AC is closed at
one end. (96cm, 160 cm)
b. Same as part “a” except column is open at
both ends. (64cm, 96cm)
3. The third resonant length of a closed air
column resonating to a tuning fork is 95
cm. Determine the first and second
resonant lengths. (19 cm, 57cm)
12. 4. A pipe organ, open at both ends, must resonate at 128 Hz.
The organ has been designed to be played at a
temperature of 22 0
C.
a. How long does the organ pipe need to be? (Assumption?)
b. If one end is closed by a stopper, at what new
fundamental frequency will it resonate? (1.34 m, 64 Hz)
5. An AC open at both ends has a fundamental frequency of
256 Hz. Determine the frequencies of the first and
second overtones. (512 Hz, 768 Hz)
6. A slightly smaller plastic pipe is inserted into a second
plastic pipe and the resulting variable length AC is open
at both ends. A tuning fork of unknown frequency is
allowed to vibrate over one end of the AC and resonance
is heard when the AC is 38 cm long and then again when
it is 57 cm long.
a. Calculate the wavelength of the vibration created by the
tuning fork. (38 cm)
b. If the air temperature is 180
C, determine the frequency of
the tuning fork. (9.0x102
Hz)