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Questions tagged [harmonics]

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0answers
34 views

Why a musical instrument's string oscillates with many frequencies? [duplicate]

I am trying to understand why when we play a note on a stringed instrument, not only it oscillates with it's fundamental frequency but also the multiples of that. For instance if you play a D on the ...
3
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0answers
27 views

Harmonics in a tube closed at one end

I have been learning about sound and how a tube closed at one end only seems to have odd harmonics. However, I have found that although clarinet follows this and plays only odd harmonics, saxophone ...
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1answer
37 views

De Broglie explanation of Bohr's second postulate. discrepancy of 2 times?

I am reading how de Broglie justified the 2nd postulate of Niels Bohr (i.e. angular momentum of an electron to be integral multiple of $\frac{h}{2\pi}$). I get his explanation of electron acting like ...
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1answer
52 views

Why the faster you spin the highest the pitch get in a whirly tube?

I would like to understand why the faster you spin, higher normal modes are excited This is the tube i'm talking about, i think it's used as a kid's toy: https://www.youtube.com/watch?v=eCOZxzO3FvE ...
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0answers
51 views

sounds of polygonal ring chimes of metal

Suppose we have a number of rings, each of them is constructed from some mass of wrought iron or steel: each ring is a polygon, which I would like to suppose is constructed without welding (so they ...
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1answer
50 views

Integer multiples of fundamental time period? [closed]

If we define harmonics to be positive integer multiple of fundamental frequency What will we say to positive integer multiples of fundamental period?
2
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1answer
79 views

Is the first harmonic the prevalent frequency? [closed]

Why, when we play a string, almost all of the energy we give them is ''used'' in the first harmonic (the fundamental frequency) rather than be distributed between all of them?
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0answers
26 views

Which characteristic of sound, makes it possible to recognize a person without seeing him? [duplicate]

Will it be Pitch or Quality? I have read that Pitch can help to distinguish between a man and a woman's voice but what if they are of the same sex?
11
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4answers
3k views

If all harmonics are generated by plucking, how does a guitar string produce a pure frequency sound?

A guitar is a plucked instrument and it is played by plucking a string at an off-centre point fixed at two ends. In general, Fourier analysis tells that all harmonics (the resonant frequencies of the ...
1
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1answer
46 views

Why are there these other “harmonics” (violin-specific terminology) in violins?

I've often read explanations of how standing waves form on the string of a violin and their harmonics but there is another phenomenon I've never seen explained: When you play certain notes, musicians ...
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0answers
7 views

What counts as a “load” on an ultrasonic transducer?

I’m trying to build an ultrasonic knife for my work. I have a 40khz ultrasonic transducer and driver circuit. It’s the same kind of transducers used in ultrasonic cleaners. I have read that the ...
4
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3answers
79 views

Why, in an open or half-open pipe, must an open end of a standing sound wave have a pressure of zero?

I believe this question was asked in some form before, but I'm not clear on the answer. If a sound wave must equal air pressure when it exits a tube, why is it possible that at many points after the ...
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1answer
76 views

Pulling a string with both ends fixed [duplicate]

Consider a string with both ends fixed. If somewhere in middle of it be pulled and released, how would it oscillate and what is it's equation? My solution assuming the result is a standing wave: The ...
4
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2answers
112 views

How is it possible that multiple overtones can exist at the same time?

I was wondering how it is possible for overtones to co-exist at the same time. When one pulls a string, it starts to oscillate and forms a standing wave with frequency $$f_0 = f$$ Additionally, ...
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0answers
14 views

Deconstructing harmonics

If I am firing a burner into a cylindrical chamber with a flat rear refractory wall, and we are experiencing constructive amplitude because of a coincidence of sound frequency and vessel length - can ...
1
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1answer
32 views

How do we hear harmonics and how does it affect audio fidelity?

First and foremost, do we hear a sound wave as a sum of all the individual harmonics, at the fundamental frequency, or do we hear all the associated harmonics above the fundamental frequency and ...
0
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0answers
18 views

Sawtooth synthesis using random harmonic phase

I was experimenting with Octave and NumPy/SciPy by synthesizing (reverse) sawtooth waves and decided to find out what a sawtooth comprised of harmonics with arbitrary phases would sound like. Note ...
1
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1answer
46 views

Can we consider oscillation of air column in the wind instruments as phonons subject to Bose- Einstein statistics ?

A flute is a wind instrument, which could be modelled as a resonance cylinder open at both ends. Any cylinder resonates at multiple frequencies. A skilful player produces a standing wave in the flute ...
2
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2answers
102 views

At what frequency does a string vibrate?

When a string with fixed ends vibrates (e.g. plucking a guitar string) Fourier Theorem says that the vibration can be expressed as a sum of its normal modes, which are sinusoidal vibrations with ...
0
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2answers
28 views

Which book would you recommend for a dummy wanting to start studying acoustics, out of interest?

I've been very into acoustics lately, specifically the harmonic series. I find it fascinating how the harmonic series works as a sort of guideline to harmony, and how we base tuning systems on trying ...
2
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1answer
107 views

Where do pure tones occur in nature, besides harmonics?

When you sound a tuning fork, you hear an pure tone/sine wave of usually 440Hz. Yesterday, I tried hitting a table knife made entirely from stainless steel against a grapefruit. When I held it up to ...
1
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1answer
45 views

Are These Guitar Strings Demonstrating Subharmonics?

This video has a fair few instances where there is an exaggerated wiggling of the guitar strings. I rationalise this by saying its a similar effect to rotoscoping, like where wheels appear to spin ...
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2answers
53 views

Is second harmonic generation a special case of high harmonic generation?

That might be a strange question, but while I was researching for these topics, I never found an explicit statement that would answer that question. (That might be because of the different ...
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2answers
89 views

If a guitar note is determined by the fundamental frequency, what is the relationship between this and octaves?

All the research I've been doing tells me that a guitar note is determined by the fundamental frequency played. But say you play an A on the open A string (110 Hz), and then play a higher octave A by ...
21
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4answers
3k views

How are overtones produced by plucking a string?

I read the following from wikipedia: When a string is plucked normally, the ear tends to hear the fundamental frequency most prominently, but the overall sound is also colored by the presence ...
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1answer
38 views

Why do two tubes with different lengths produce different frequencies?

I've learned that it has to do with harmonic frequencies and the relationship between length and wavelength in the equation $L = n(\frac{\lambda}2)$, but my question is why? If you were to blow air ...
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3answers
49 views

What does it mean that standing waves oscillate in phase?

What does it mean that all points between two adjacent nodes in a standing wave oscillate in phase? I sort of get what in phase means, it means that the peaks and troughs etc of 2 waves align. But how ...
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2answers
73 views

On Harmonics In Physics

I am an IB physics student. I am very confused about the concept of first, second, third, etc harmonics. My questions are: How does a wave get from first to second harmonic, and from second ...
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2answers
74 views

A pure sine wave vs. the infinite sum of its harmonics

Is a pure sine wave equivalent to the sum of its every harmonic (up to infinity and without the fundamental lets assume)? Moreover, if it is so, is this the reason why all the harmonics are present ...
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3answers
787 views

What is fundamental frequency, how does it make sense?

I’m currently going through harmonics, and I do not at all understand the fundamental frequency. I understand that it is the simplest vibration of a string, but I don't understand how can it have ...
4
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1answer
67 views

Calculating the decay rates for modes of an ideal circular membrane (ie. drum head) using wave equations?

I am attempting to solve for the theoretical decay rates of the various (m,n) modes of an ideal circular membrane, if that membrane is excited momentarily by an impulse or deformation. I would ...
1
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1answer
149 views

Fourier Series Analysis [duplicate]

Can anybody explain this paragraph from the chapter " Fourier series and transform " of the book by M l Boas? "If you strike a piano key you do not get a sound wave of just one frequency . ...
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2answers
98 views

Creating sympathetic resonance in a guitar string with an electromagnet

I have an idea for a potential new type of reverb and I wanted to know if it was possible/practical. The idea is to have an electromagnet in the middle of a guitar string(s) which will hopefully ...
-1
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3answers
103 views

Do traveling sound waves have harmonics?

I know that standing waves produce harmonics but what about traveling waves that dont reflect back on itself? Do traveling sound waves have partials that are harmonic(integer multiple of the ...
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1answer
65 views

Must all periodic sound waves have harmonics?

Does there exist a periodic sound wave that has partials which are not integer multiples of the fundamental frequency?
-1
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1answer
436 views

What is the difference between octaves and harmonics? [closed]

my question is about the importance of Octaves vs harmonics? What is the difference between these two concepts?
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1answer
196 views

dependence of fundamental frequency of vibration of a stretched string on the medium in which it is kept [closed]

suppose a stretched wire's fundamental frequency in air is 280 Hz. What would be it's fundamental frequency in water ? (all other conditions of the string remain same) I looked into the laws of ...
5
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1answer
74 views

Are there physics, theories that predict standing wave harmonic deviations in curved tubes?

For cylinders, it's widely documented how to predict the harmonic frequencies given the length of the tube, the end conditions and the speed of sound which is in turn determined by what gas is in the ...
3
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1answer
56 views

How can a 2.1 Hz excitation induce resonant vibrations in a structure with a fundamental frequency at 6.3 Hz?

I've come across an example given in a footfall design guide wherein it's mentioned that a floor with a fundamental frequency of 6.3 Hz can be excited to resonance by a person walking at 2.1 Hz ...
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1answer
89 views

What is 'harmonic likeness'?

While reading about sympathetic vibrations/resonance, I came across the term 'harmonic likeness'. Sympathetic resonance or sympathetic vibration is a harmonic phenomenon wherein a formerly passive ...
5
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3answers
311 views

Unwanted frequencies in sawtooth tone

Since 440 represents an A note, a 55 Hz tone also represents an A, since it is at 1/8 the frequency. However, when I generate this note in Audacity, I always get unwanted frequencies appearing as ...
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2answers
124 views

Standing waves of a string

Why standing waves cannot be form from every frequency but only a particular frequency? I understand standing waves as a pattern that will be formed from one wave interfering with another, but i dont ...
0
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1answer
198 views

Varying amplitude of beats

Why is the product of 2X and cosine delta t divided by 2 is the varying amplitude and not the other 2X and cosine function?
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3answers
154 views

Does a harmonic become a fundamental of its own harmonic series?

Simple question, hopefully there's a simple answer. I'm about half a piano tuner, not a physicist. A musical tone has a fundamental frequency, say $220\,\text{Hz}$. Its second harmonic is $440\,\...
3
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3answers
238 views

Are square wave harmonics real-life phenomena or just mathematical abstractions?

Based on my limited knowledge, it is my understanding that square waves can be mathematically broken down into an infinite sum of sinusoidal waves (of different amplitudes, frequency, etc) . This is ...
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2answers
439 views

Dynamics - bungee jumping [closed]

A bungee rope is specifically designed and its spring constant is known. The rope is stretched to twice its normal length by a person of mass 75kg hanging at rest from the free end. The length is ...
1
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3answers
161 views

Music / Harmonics [duplicate]

I am trying to understand the physics behind waves, sound, and music and feel as if I'm missing some important conceptual components. How is it even possible for a string to vibrate at multiple ...
0
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1answer
52 views

Can we calculate that a certain Force is equal to how much Weight?

If I connect one end of a big spring to the ground and pull up the other end... How much weight I will be lifting in that moment? Does it increase as I'm pulling up or it remains a constant thing for ...
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2answers
46 views

How to find the wave pattern recorded by the microphone

Two identical tuning forks, vibrating with identical amplitude at a frequency of 660 Hz, are brought towards a microphone from opposite direction with speeds 1 m/s and 2 m/s respectively.At the time ...
0
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1answer
356 views

Harmonics for standing wave pattern in pipes and strings

So I was reading about standing wave patterns in strings and pipes however I could not get an intuitive sense about how a harmonic was defined in each case. In the case of a string, the harmonics made ...