Questions tagged [frequency]
Frequency is the rate of repetitive aspect in the amplitude over a given dimension.
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angular oscillation frequency of system with two springs
Say you have two springs with stiffness $k_1$, and $k_2$ respectively. These springs hold a mass $m$ from floor to mass, and mass to ceiling to form a system, as per this diagram:
Now, the angular ...
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Does the worldline of light depend on the frequency?
My Question is:
If 2 rays of light are emitted with different frequencies from the same spacetime point, does an observer see them in the same worldline?
I know that the worldline of light behaves ...
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Do TDMA channels get use of the full channel/bandwidth?
I know that for FDMA, each user is allocated a specific frequency at the same time, but does that mean TDMA assigns a user to different time slots on the same frequency, so that when the user's time ...
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Sound problems on frequency [on hold]
Does frequency depend on the number of wavelength the source makes per second? Is it wavelengths? And what is the definition of amplitude?
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Derivation of the formula for the fundamental frequency of a stretched string [on hold]
I'm trying to derive the formula: $$f=\frac{1}{2L}\sqrt{\frac{T}{\mu}}$$
but I'm running into trouble with a $\theta$.
Taking a string of length $L$ vibrating at the fundamental frequency $f$ we get ...
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Higher frequency waves
Can we artificially create extremely high frequency waves in the ( order of 10^60 )? how hard is it to create high frequency waves, and what limits are potential in doing so...
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Why can I hear the treble sounds through a speaker, such as on my phone, better than I can with headphones?
I'm not sure if this is related to my hearing loss, or if anyone else has noticed it, but I find it easier to hear higher frequency sounds coming out of a speaker that I hold up against my ear versus ...
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Planck equation in terms of frequency [duplicate]
Given $$u (\lambda) d\lambda = \frac{8 \pi hc \lambda ^{-5}}{e^{\frac {hc}{\lambda k t}}-1}d\lambda,$$ I want to convert this into frequency form $u(\nu)d \nu$. Basically, I want to covert the amount ...
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How do I find out the tension and the weight of a string with a given frequency?
I'm trying to build my own string instrument. I can make the string however long I want it to be, the instrument should play a B which is at 493.9Hz. What calculations do I need to do?
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How does the thickness of a string affect the frequency?
I've notice that thicker strings have lower frequencies, but is there a specific relationship between theses two?
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Predicting the Frequencies of Visible Light [closed]
Why can't the Standard Model predict the frequency range of visible light; which must rather be inferred from measures of wavelength?
Given that QFT is a gauge theory in which, since the fields are ...
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Frequency modes of the rectangular shell
The shapes of three natural modes having the frequencies $w_1$, $w_2$, $w_3$ of the rectangular shell are presented in the figure. The exciting pressure $p(t)$ applied uniformly all over the one side ...
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Plasma Waves at Different Frequencies
I am trying to determine what plasma waves appear at what frequency ranges. Particularly, I am interested in exploring plasma waves occurring between 100kHz to 1MHz. Is this a bad frequency range to ...
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Resonant frequencies of a fully closed tube
What is the pattern for resonant frequencies of a tube closed at BOTH ends?
The cases for the string, the open tube and the tube closed at one ends are well known.
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65 views
Why do objects have a Natural Frequency? [closed]
Why should an object even have a natural frequency, why not vibrate at any other frequency? This just sounds nonsensical.
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What causes a harmonica note to drop in pitch (AKA bend)?
I understand how I can lower the pitch of any note on my trumpet, regardless of the volume, by slowing the rate of vibrations of my lips. But how is it that I can lower (AKA bend) the pitch of a reed ...
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Resonant frequency of Split Ring Resonator (SRR)
I am working on circular and square split ring resonator design as part of my thesis. I wrote a Matlab code to calculate SRR resonant frequency but I am not getting the same answer of any published ...
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1answer
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Natural and Driving Frequency of a Spring-Mass System
Does $$f = \frac{1}{2\pi}\sqrt{\frac{k}{m}}$$ measure the natural frequency or driving frequency of a spring-mass system? I can't find any resources which confirm this!
I believe it measures the ...
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Property of light in different media?
Shouldn't keeping a colored frame in front a flash light ( white light ) change its wavelength or frequency?But I have also learned that light doesn't change its frequency when going from one medium ...
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Whether this proof regarding Bohr's second postulate is true or false?
Let us assume a particle oscillating with displacement $x$.
Now $x = A\sin(2πft)$
$$\frac{\mathrm d x}{\mathrm dt} = v = 2πfA\cos(2πft)$$
Now $KE_\text{max}$ can be given when cosine value is 1; ...
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A question on the properties of wave equations
When you change
$$y(x,t)=A\sin(kx-ωt+φ) $$
into
$$y(x,t)=A\sin(2kx-2ωt+φ), $$
does it double the wavelength because $k$ changes into $2k$ and double the frequency since ω is doubled?
If this is ...
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1answer
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Characteristics of acoustic resonator with a constant gain frequency response
What would be the theoretical characteristics of an acoustic resonator cavity which has a completely flat gain frequency response over 200Hz-3000Hz (Roughly the range of a violin)
In other words, ...
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1answer
89 views
Beat frequency with tuning forks
If you have two tuning forks and you know that one tuning fork is 305 Hz, and when the tuning forks are pinged together you get a beat frequency of 6 Hz, then you know that the other tuning fork is ...
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1answer
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Frequency gap between neighbouring spectral lines
According to classical theory the atomic line spectra are discrete and their frequencies quantized.
Have the newer quantum theories changed anything since then, giving some other expressions for the ...
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2answers
27 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 ...
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Probability at temperature in system has energy
Salutations, I'm starting in statistical mechanics and reviewing some related studying cases I would like to understand what occurs in small systems with normal modes of vibration, for example, a ...
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3answers
56 views
energy of a photon for a complex wave
If I use a plane wave of light given by
$$E=E_o \sin(\omega t+\phi)$$
for photoelectric effect, then the energy of photon associated is given by $h\nu$ where $\nu=\frac{\omega}{2\pi}$
But suppose ...
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3answers
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Frequency Chirp, Instantaneous Frequency and Photons
I understand ideas coming from Optics, such as the concept of frequency chirp and instantaneous frequency, and their use in nonlinear optics. However, I am struggling in giving them an intuitive ...
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1answer
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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 ...
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2answers
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Why we do not use $v=f \lambda$ for the waves associated with particles?
As the waves travel with velocity $$v= f \lambda,$$ where $v$ is velocity, $f$ is frequency and $\lambda$ is wavelength. Here we can see that velocity of wave is directly proportional to wavelength. ...
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How is the frequency of the dipole oscillation related to the frequency of the wave emitted by the dipole?
An oscillating electric dipole with frequency $\omega$ has a power $P\propto \omega^4$. How is the frequency of the emitted wave related to the dipole oscillation frequency?
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1answer
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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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Producing mosquitoe buzzing sound with a stick
Male mosquitoes beat their wings 450 to 600 times per second.
If I take a piece of stick and somehow vibrate it back and forth 500 times per second, does that imitate the buzzing sound of mosquitoes?
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Speed and frequency of a transverse wave traveling through a string made of different materials [closed]
Say a wave generated by an oscillation machine is traveling through a string.
Will the frequency of the wave be the same across the string if:
The string is made up of 2 different materials with the ...
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Does light change its color when the refractive index changes? How? [duplicate]
When light passes through materials with different refractive indices $n$, its speed will change to $v = \frac{c}{n}$. Given that $v = \lambda\nu$, either $\lambda$ (wavelength) or $\nu$ (frequency) ...
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1answer
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Frequency response of the waveguide
So, I have signal in the waveguide that is transmitted by two modes of radiation, for which the delay is for example $τ1 = 6ns$, $τ2 = 6.5ns$, respectively. And the energy supplied to the receiver by ...
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1answer
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What is the difference between Wien's Displacement Law for peak frequency vs peak wavelength?
While doing research for a high school report I came across the fact that WDL actually has two forms, one for peak frequency and one for peak wavelength, and that these two forms are not the same and ...
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Leaky waveguide - calculating the frequency [closed]
The figure shows a waveguide with a square cross-section. The length of the side of the cross-section is $a = 3.5$ . A TE wave with a frequency f propagates in the waveguide in the positive direction ...
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What is the uncertainty on 50 Hz a.c.?
We are doing an experiment to measure velocity using the ticker-tape timer which runs on a 50 Hz a.c. 12 V power supply. I am in Ireland. So the time interval between each pair of dots is 0.02 s. But ...
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2answers
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What does resonant frequency in the Q factor mean?
For the Q factor of a body undergoing force oscillations, does resonant frequency refers to the frequency of driving frequency or the body's natural frequency?
The term resonant frequency seems to ...
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3answers
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Why do sensors that emit higher frequency signals give more accurate data?
I am doing a technical presentation about RADAR and LiDAR. I understand that LiDAR is several times more accurate and capable of producing really detailed 3-D maps of their surroundings, while RADARs ...
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1answer
59 views
Is there an angular period?
I was looking at Wikipedia’s page for angular frequency and it had a picture that had a cube with each vertex representing different frequencies and periods, however the angular period just said “?”. ...
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1answer
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PiezoActuator energy loss in a fluidic environment
I am trying to model the loss of a Piezo actuator in a fluidic environment.
A Piezo actuator can be modeled using a Equivalent Circuit model stated below.
http://www.noliac.com/typo3temp/GB/...
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1answer
38 views
Converting $\mathrm{ps/nm}$ to $\mathrm{ps}^2$
I have a dataset in the unit $\mathrm{ps/nm}$ for many different $\lambda$ which I want to convert to $\mathrm{ps}^2$.
I guess I can assume that I only deal with Gaussian bandwidths such that $1\ \...
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4answers
95 views
In $E=hf$, can $f$ assume any positive value? (Beginner) [duplicate]
The energy of photon is given by the equation $E=hf$, where $h=$ Planck's constant, and f=frequency of radiation. Is f quantized, or can it assume any value?
If it can assume any value, then wouldn'...
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2answers
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Finding frequency from phasor in EM wave
Here’s a homework question from my class on electromagnetism:
The electric field phasor is $\mathbf E = E_0[3\cos x\sin2y,\enspace 6\sin x\cos2y,\enspace j\,5\sin x\sin2y]e^{-3jz}\,$.
What is ...
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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 ...
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2answers
149 views
What is the physical interpretation of dividing $2\pi$ by a variable?
Looking at the angular wavenumber eqn:
$$k = \frac{2\pi}{\lambda} = \frac{2\pi\nu}{v_p} = \frac{\omega}{v_p}$$
I'm curious what it means to divide $2\pi$ by the wavelength and why $2\pi$ was chosen....
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3answers
137 views
As light travels upward in the earth’s gravitational field, it loses energy, and so its frequency goes down?
I have read this question:
Light frequency and time relation
where it says:
As light travels upward in the earth’s gravitational field, it loses energy, and so its frequency goes down. (This ...
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3answers
94 views
A question regarding the speed of light in a vacuum, specifically putting a 'color' in
I know that red and blue etc. lights are produced when 'white' light is put through mediums.
I have learned that all light in a vacuum, all electromagnetic waves, travel at the same speed in a ...
