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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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Do photons exist at all possible wavelengths? [duplicate]

My question refers to Photon flux spectrum diagrams. The diagram shows the number of photons at different wavelengths. My question is whether the graph is granular or continuous. Do photons exist at ...
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Change in pitch on a flute due to blowing at a different angle

Why is it that the location of where the air hits the inside of a tube, the pitch is affected? When playing the flute, directing the air downwards lowers the pitch. Another student suggested that this ...
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4answers
542 views

Sound waves in different octaves

How do the sound waves compare between different octaves? Why is it that you can play a low c and a c, and they are at different frequencies, but the same tone? An octave above a note is the fourth ...
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1answer
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How to calculate the frequency of the waves [on hold]

Here a square wooden block is made to rotate 3000 times per minute. A springy metal strip presses against the block, as shown in figure below. A person nearby observes what is happening. Calculate ...
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1answer
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Why are angular velocity and angular frequency not measured in Hertz?

Recently, I was doing my homework and I found out that Angular Velocity and Angular Frequency can be calculated using $\omega=v/r$. This means the units of torque are (meter/second)/meter or 1/second. ...
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What is complex frequency? [on hold]

I am learning EE, and about complex frequencies, but what is its physical meaning? What is it used for? Why is it? And only happen in the laplace transform?
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In the SHM equation $F= -kx$, $k =mw^2$ why not use $mf^2$ where $f$ is frequency $w$ here comes out to be $1/s$ not $\text{rad}/s$?

The reason I am stating this is because on calculating the units of w(omega) I found is equal to s^-1 not regular the rad/s. Proof: ...
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What is the closest distance you can be to two speakers so that the frequency they produce is not audible? [closed]

The question is given as above. They only give the distance between the two speakers, 8.5 m. I know we have to use the formula where the path difference equals (n-1/2)pi, however, I don't know how to ...
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Multiple frequencies [closed]

could someone please inform me how it is possible to send multiple frequencies down one wire? I’m referring specifically to a communication protocol known as HART. It seems they send a 4-20mA signal ...
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1answer
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Is there an equation to relate a glass's frequency to its mass when it's struck with a spoon?

The mass therefore would be changing because I am pouring in water and testing the frequency at different volumes. Obviously as the volume increases the mass increases and the frequency decreases. ...
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Superposition of light waves of different colors

Can someone please assist? My question is regarding visible light. If, for example, red light and blue light are waves of different wavelengths and frequencies then how do they combine with all the ...
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1answer
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Deciding amplitude for Beats

I have two harmonic sound waves of nearly equal angular frequencies $\omega_1$ and $\omega_2$, and whose equations(which I have particularly modified for convenience), are $$s_1=a.\cos\omega_1 t$$ $$ ...
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Why do we take the derivative of the number of modes with respect to frequency (Rayleigh-Jeans)

Source: http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/rayj.html We arrive at this result: $$N(\nu)=\frac{4}{3}\frac{\pi L^3\nu^3}{c^3}.$$ So now we have a function representing the number of ...
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Why does a sonar or radar's frequency correlate with its resolution?

A sonar's (or radar's) frequency determines its limit on the smallest size that it can detect and its resolution. I've heard that it's due to aliasing, if so, please explain the reason behind it a ...
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3answers
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Why does the frequency of a wave does not change on reflection and on transmission? [duplicate]

I wanted to know why the frequency of a wave does not change even on reflection or transmission and does it only depends on the source only.
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2answers
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Yi's Bell sound and how it relates to temperature?

Yi's Bell is an ancient chinese musical instrument that plays different sound frequencies when its heated than when its in room temperature. My question is Why does that happen? Why does higher body ...
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1answer
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About sound of non-existent channels on FM

Well, I have learnt about resonant frequency due to series capacitor and inductor, and how the current at resonant frequency is highest, but i am confused about the sound, which appears even when no ...
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1answer
48 views

Energy-frequency dependency of a photon and its medium of propagation

Is the equation relating a photon's energy to its frequency the same regardless of its medium of propagation? And for the equation relating its momentum to wavelength as well?
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Microwaves in other media

I saw a video on how microwaving grapes make plasma. He said that the refractive index of microwave is about 10 inside the grape. Now, we don't know the wavelength of the microwaves in the grape or ...
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How can I use a frequency counter to show the rpm of a spinning disc?

I don't want to unbalance the disc by attaching anything heavy to it. Is there a way of doing this optically?
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1answer
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Where does the sound we hear from short circuits come from?

Title is self explanatory. Whenever I see or watch a short circuit happening, there is always a humming/buzzing sound going on (e.g., the sounds we hear from this short circuit compilation video). ...
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2answers
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How can be various frequencies in one place?

How can we receive different radio shows in one place, they are coded in phase or frequency or amplitude of electromagnetic waves, but shouldnt elecreomagnetic waves interact each other, and all ...
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1answer
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Wavelength of Intermittent Laser vs Prism

The following YouTube video from Sixty Symbols ( What is the maximum Bandwidth? - Sixty Symbols https://www.youtube.com/watch?v=0OOmSyaoAt0 )states that only a laser which always shines truly shines ...
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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 ...
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1answer
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Photoelectric Current [duplicate]

Recently learnt that Intensity= nhv ; where n is the number of photos per unit area My textbook specifies that the photoelectric current only depends upon the number of photons striking per unit time ...
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2answers
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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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How to distinguish between angular frequency $\omega$ and frequency $f$

The relation between the "regular" frequency $f$ and the angular frequency $\omega$ ($\omega = 2\pi f$) is clear to me. However, every time I see "rotations per second" I really get confused as to ...
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The length of a string attached to a wall?

I feel really dumb for asking this question. I apologize in advance. When the example of a string attached to a wall is given to explain waves and the ressonance frequencies, the length of the string ...
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4answers
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Using sound to change the color/wavelength of light

Is it possible to use sound to change the wavelength of light, and therefore its perceived color? In an effort to rephrase my question from the information gained in the first answer, would it then ...
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1answer
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Why is frequency equal to the inverse of period?

I am really struggling with this concept, please help. I know that the period is simply the time for 1 for one complete cycle, but how come the frequency is 1 over this? It is confusing to me
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Fourier Coefficients

Suppose i've a two voice samples v1 and v2. Comparatively voice v1 is louder than the v2. If both the voice is spoken by the same person.(Spoken normally as he speaks) Is it good to state the ...
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1answer
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What exactly determines the frequency of sound in air?

When we swing a stick in air (one way.. not back and forth), we hear sound if we swing it fast enough. Is the reason we hear it because by swinging fast enough we also make the amplitude of sound wave ...
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1answer
38 views

sound waves , standing waves,wind chimes [closed]

I don't know how to approach this problem. It's been bothering me for months. The answer seems to be the rod with shortest length
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Time's ticking slower vs. fewer events' occurring [closed]

In modern physics, or at least its non-mathematical version for laymen, we hear of time's "going slower" or "faster." In the rocket experiment for the Twin Paradox, for example, time "went slower" ...
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If everything has color, can we describe an object in frequency? [closed]

If color we see is the reflected color, is everything every frequency and we are like the tuning knob on a radio, electrons oscillating accordingly? An excerpt from The Little Book of String Theory ...
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1answer
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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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1answer
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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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1answer
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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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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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1answer
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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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1answer
23 views

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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1answer
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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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1answer
56 views

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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0answers
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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
65 views

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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2answers
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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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1answer
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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; ...