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Questions tagged [frequency]

Frequency is the rate of repetitive aspect in the amplitude over a given dimension.

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What is the frequency of a standing wave? [closed]

I understand that constructive interference of waves results in standing waves. And for a wire with both ends fixed the frequency should match the fundamental frequency of the wire to produce standing ...
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What is the mathematical support for the formula $f_n = n f_1$, used to calculate the frequency of a standing wave? [closed]

could someone explain to me the mathematical support for the formula $f_n = n f_1$. This formula refers to the fact that the frequency of a standing wave is equal to the number of antinodes times the ...
Santiago Celis's user avatar
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Can the laser light, in principle, take any wavelength in the EM spectrum?

Can the laser light, in principle, take any wavelength in the EM spectrum? I don't think there is what prevent this in principle, right?
Jack's user avatar
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Wavelength and frequency of the peak of the black body radiation [duplicate]

Why does the product of the peak wavelength and the peak frequency of Planck's black body radiation not equal to the speed of light? $$λ_{\mathrm{max}}=\frac{hc}{4.97\mathrm{kT}},$$ while $$ν_{\mathrm{...
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Why does this RLC behavior differ from what equations predict?

In order to better understand RLC behavior under current sources, I constructed the simple circuit below and attempted to analyze it. However, my equations do not agree with simulation results. The ...
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Changing the frequency of the tuning forks

I just bought some tuning forks with frequencies of 128 Hz and 512 Hz. However, when I tested them using an app, their frequencies turned out to be lower than the specified values. How can I increase ...
zarvis12's user avatar
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Phase-Based Ranging

I've been reading a lot about Phase-Based Ranging (PBR), and it's all starting to become very intuitive. BUT; There is one technical, but extremely important, detail that seems to escape me. When the ...
Hysan Happy's user avatar
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2 answers
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Angular frequency vector, when explaining the motion of a wave

The wave number $|k|$ results as the magnitude of the wave vector $k$. Is there an analogous vector from which the angular frequency $\omega$ results when the magnitude is formed? If yes, how can you ...
plantpot's user avatar
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How to measure the vibration of an object on a video shot at high speed camere?

I have a video fragment which I split into frames (pictures). I use them in pairs (1 frame with 2, 2 with 3, etc.) to find shifts on x and y axes (i.e. how much I need to shift 1 frame to make it like ...
tryingmybest's user avatar
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What are the different types of resonances in forced oscillation systems?

I'm currently studying resonances in systems subjected to forced oscillations and have come across various terms and cases that I'd like to understand more clearly. Specifically, I am analyzing a ...
Bananza41's user avatar
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Is there any deeper explanation behind this simple acoustic experiment?

my question is a bit inconvenient but let me explain: I recently saw an experiment for primary school where two strings are attended to a coat hanger (see here: https://www.youtube.com/watch?v=...
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Why does the phase difference of the capacitor voltage change with AC frequency?

In the graph below, the left vertical axis of the graph is the magnitude of voltage, the green line indicating the input voltage, blue line indicating the capacitor/inductor voltage. The right ...
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Can anyone please give some explanation in terms of the frequency domain of the time evolution?

This might be a silly question. But I was puzzled for a long time, even some comments are greatly appreciated. Is it possible to claim that "All the time domain evolution can be thought of ...
MathArt's user avatar
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Why does the energy (and thus frequency) of a photon entering glass stay constant if some is used up to accelerate electrons and slow down the light?

I'm learning optics and have been told that when light enters a medium (e.g. glass) and slows down the frequency of the light stays constant while it is the wavelength which is reduced. The ...
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I don't understand intuitively why the instantaneous frequency is obtained by calculating the time derivative of the phase

I don't understand intuitively why the instantaneous frequency is obtained by calculating the time derivative of the phase
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Does sunlight have a modulation frequency?

By frequency, I don't mean electromagnetic frequency, I mean modulation frequency. For example, I can put a PWM square wave on an LED at some frequency, which I can detect with a photodiode and a ...
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What's the difference between the different kinds of EM waves?

I am an A-level student. We have traditionally been taught that different types of EM waves exist only between certain ranges of wavelengths and frequencies. However, I learned that electromagnetic ...
Haram Tanveer's user avatar
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Why do we see objects with a given color?

I'm currently studying Electromagnetic Optics, and I don't quite understand the (classical) process through which we perceive an object with a given color. From my understanding, I'd make a ...
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Who wrote $c = λ ν$ for the first time and where can I find it?

I have been surfing for days and still I could not find who wrote the equation $c=λν$ for the first time. Neither I found a name for this equation. A lot about Planck's constant and energy related ...
Pierpaolo Testavuota's user avatar
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2 answers
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General formula for the frequency

The orbital period of a satellite is the time it takes to complete an entire orbit around the celestial body around which it orbits. I know that the orbital period using the following formula: $$T = \...
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Why Does Planck's Relation $E=hf$ Imply a Linear Relationship Only for Sinusoidal Frequency Bases?

I have been studying quantum mechanics and I came across Planck's relation which describes the energy $E$ of a photon as being directly proportional to its frequency $f$, with Planck's constant $h$ as ...
CuriousMind's user avatar
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Why are laser linewidths in frequency domain?

I am learning about the lasers and I find one thing confusing about the lasers. I understand that there is a range of wavelength laser, it is never exactly monochromatic. So, I understand the concept ...
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Why color depends on frequency and not on wavelength? [duplicate]

To explain my question lets consider this example: The wavelength of light in a medium is $\lambda=\lambda_{0}/\mu$, where $\lambda_{0}$ is the wavelength in vacuum. A beam of red light ($\lambda_{0}=...
Devansh Mittal's user avatar
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Why do water surfaces have persistent "average wavelength" patches?

Have you ever stood above a river or lake and noticed that the surface has visible "patches"? It looks like the surface has different average wavelengths in some areas, leading to the light ...
Robert Wegner's user avatar
2 votes
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How can the Rabi frequency be complex?

I've been doing some reading and came across a simple implementation of the Hadamard gate using Rabi oscillations of an atom in a laser field. However, the author mentions that it required the Rabi ...
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What duration of a white noise burst is required for it to be "white" at a given frequency or frequency range?

I am running white noise bursts (with very short ramps on/off to prevent discontinuities) through underdamped resonant bandpasses which are tuned to any given $f_0$ and an underdamped $Q$. Continuous ...
mike's user avatar
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Is natural frequency a local or global property?

Some objects have a natural frequency. This can be anything from a metal ball to a table, etc. When we hit such an object, it will start vibrating with a certain frequency $f$. Because of damping the ...
Riemann's user avatar
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Should natural frequency be modeled using molecules?

Consider an object. This can be anything from a metal ball to a table, etc. Now this object has a natural frequency. When we hit the object, it will start vibrating with a certain frequency $f$. ...
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Orbital frequency of gravitational wave prior to merger [closed]

In the paper The basic physics of the binary black hole merger GW150914 Equation [A5] states that $$\dot \omega^3=\left(\frac{96}{5}\right)^3\frac{\omega^{11}}{c^{15}}\left(G\mathscr M\right)^5 \tag{...
Halcyon Mo's user avatar
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Frequence vs speed of a moving object

Imagine swinging wood stick using hand (say it's a 1-meter long cylinder with 2 centimeter diameter, just for the sake of argument). When doing it fast (angular velocity = $\omega_1$), it will create ...
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Damped Quantum Harmonic Oscillator with sinusoidal driving force

The standard Damped one-dimensional Harmonic Oscillator with sinusoidal driving force has equation $$\frac{d^2}{dt^2}x(t)+2\zeta\omega_0\frac{d}{dt}x(t)+\omega_0^2x(t)=\frac{1}{m}F_0\sin(\omega t).$$ ...
Riemann's user avatar
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Measuring the tension of a drumhead

I'm working on an experiment to see how the tension of a drumhead impacts the frequency of its sound, but I'm not sure as to how I could measure this. I found this forum thread from 2012, which ...
lopmon's user avatar
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How to standardize the energy of a Dirac delta function relative to sample rate (width) and amplitude?

Background I was instructed that a Dirac delta function (impulse from $0$ to $A$ then back to $0$ at short duration) has a white noise audio frequency type excitation distribution here ie. It should ...
mike's user avatar
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Is it possible to, like white noise, excite all audio frequencies equally, but with a more immediate & less random burst? Like a signal discontinuity?

I am trying to generate an audio signal that, like white noise, has "equal intensity at different frequencies, giving it a constant power spectral density", but unlike white noise, can be ...
mike's user avatar
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What is the spectrum of a broken square drum?

Given a square drum with sides length equal to $L$, the squared raised frequencies are $(\pi m/L)^2 + (\pi n/L)^2 $ with $m,n \in \mathbb{N}^*$. Here we have four boundary conditions (no vibration on ...
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Why doesn't frequency change when the medium of the wave changes, and only depend on the source of the wave? [duplicate]

When the medium of the wave changes, the velocity and the wavelength does change, but not frequency, why?
Chethas Pai's user avatar
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Do humans hear the beat frequency or the average frequency or just individual frequencies?

We have two sound sources of the same amplitude but of slightly different frequencies : $f_1$ and $f_2$. When they are sounded simultaneously what would be the frequency that an observer hears ? I ...
wonderingwhy's user avatar
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3 answers
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Why does the equation of a wave contain the term $\omega t$ instead of $vt$ in the wave equation $y=A\sin (kx-\omega t)$?

Why does the equation of a wave contain the term $\omega t$ instead of $vt$ in the wave equation $$y=A\sin (kx-\omega t).$$ I think of the constant $k$ which for higher values increases the frequency $...
Jeffy James's user avatar
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1 answer
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String vibration dimensions

We're all familiar with the typical diagrams of standing waves of a string, as in this image from Wikipedia: The thing that bothers me is that they ignore the reality that the string is vibrating in ...
Eric Singer's user avatar
1 vote
4 answers
209 views

$0$th overtone in closed organ pipes

I know about $1$st, $2$nd or other overtones in the formula of frequency in a one-sided open system (specifically in closed organ pipes) that is $$ f = \frac{\left( 2 n + 1 \right) v}{4 L} \tag{1} \...
phymestri's user avatar
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Let's say I have manufactured a prism from a non-dispersive medium, then light coming from air wouldn't split into colours right?

Let's say I have manufactured a prism from a non-dispersive medium, then light coming from air incident on the prism wouldn't split into colours, right? I mean light still changes direction, but all ...
Jack's user avatar
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Generally speaking, the speed of a wave depends on the medium and the wave type, so waves of the same type in the same medium attain the same speed [duplicate]

My question is, given the above statement, why electromagnetic waves attain different speeds in media other than vacuum even though they are of the same type and propagate in the same medium?
Jack's user avatar
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A ball dropped onto a rotating wheel of various frequencies experiment issues

I'm doing a experiment to find the relationship between the frequency of the rotating wheel and the horizontal distance travelled by the ball dropped onto it. I am manipulating the frequency of the ...
dark sorceror's user avatar
2 votes
0 answers
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How do lower frequencies change differently than higher ones as they travel?

I read the following on the internet: "This means that as sound travels, its relative frequency content alters making the low frequencies more prominent at greater distances, creating low ...
blue_ego's user avatar
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1 answer
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Number of times the displacement of an object executing a simple harmonic motion becomes zero

I was solving some SHM problems when i came across this particular question. It asked, what is the frequency of SHM of an object whose displacement becomes zero 200 times in one second. The answer is ...
Baksish's user avatar
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1 answer
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How can one explain the small amplitude resonance before the onset of main resonance condition?

I was using a sonometer to verify the frequency of a.c. supply in the lab is 50 Hz. For this the equation I used is f=(1/4L) x Sq. root (T/m) I set tension T = 4.9 N by hanging 0.5kg mass mass per ...
Shinnaaan's user avatar
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The physics behind the circle / spiral of fifths

In music theory, there is this thing called the circle of fifths. If you take a string, and you divide it in two equal parts, you get a so called octave. It is, to our ear, kind of "the same tone&...
Willem van Houten's user avatar
19 votes
6 answers
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Can human ear hear 4 Hz frequency, if I tap my hand 4 times per second on table?

Frequency means the number of repetitions per second. Humans can hear between 20 Hz and 20 kHz, but I have a very basic question: if I tap my hand four times on a table per second, it means I am ...
Avinash Agrawal's user avatar
1 vote
1 answer
96 views

Change in Frequency while Tearing Paper

Let us assume you have a 30cm strip of paper, and you tear it lengthwise. Let us abbreviate the frequency produced when you reach the end of the paper as $f_2$ and the frequency of sound heard when ...
Schrödinger's Cat's user avatar
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1 answer
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Is sound essentially motion?

From my understanding, the only way for humans to create sound is by moving our bodies, vocal cords, or by moving other objects. So depending on how fast we or other objects can move, different ...
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