Questions tagged [frequency]
Frequency is the rate of repetitive aspect in the amplitude over a given dimension.
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Do the mathematical properties of music have undiscovered technological value? [closed]
Im just asking for ideas and opinions
The script below is just an idea of mine, the idea is an invention of 7phase modulation for radio/fiberoptic/electric channel for internet data transmission, and ...
2
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32 views
Which formulae should I use when calculating the frequency of an electron given its speed? [duplicate]
If I know the speed of an electron, how should I go about calculating its frequency?
For example, if the electron was travelling at $v$ $ms^{-1}$ there are two options I could take.
Calculate the ...
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Find the frequency range for which sea water is good conductor [closed]
if sea water has conductivity = 4 mho/m and permittivity = 9*10-9/4*3.14 F/m
find the frequency range for which sea water is good conductor.
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How to calculate the eigenfrequencies of a uniform cantilever beam? (free vibration) [closed]
Unfortunately, I lack formal training regarding this matter, but need to tackle the following problem.
Given:
Length
Beam cross-section area
area moment of inertia
material density
Young's modulus
...
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3answers
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Relation between frequencies of different harmonies
I know the relation between frequencies of different harmonies is $$ f_n = n\times f_1 $$ but I'm heving trouble to develope the equation which proves this equality. can anyone please give me a lead ...
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1answer
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Why would the frequency of an EMF wave have any relation to the wavelength?
I take a wireless antenna and I run a current through it 3 times per second.
I have now created a 3 Hz ELF frequency.
According to Wikipedia this radiation has a wavelength of 100000 km.
Needless to ...
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79 views
What is the typical order of magnitude (*numerical* in $\rm Hz$, not expression) of frequency of a gravitation wave? [duplicate]
What is the typical order of magnitude of frequency of a gravitation wave ?
I have read Frequency of gravitational waves
but they only give expression, without any quantitative numerical answer for ...
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1answer
59 views
If there is any superluminal speed measured by the observer in the relativistic rocket, how does it affect the Doppler effect?
Assume that a point rocket, as well as a diode, moves with a constant velocity $v$ towards a planet on which an observer $A$ is located. (Locate the diode, rocket and $A$ respectively from left to ...
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How does a sound wave behave at a phase transition?
I wonder about the following:
A shock wave is propagating from within a solid body outside into a liquid. How will it behave? Especially, will the frequency remain the same?
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1answer
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String Theory Query
I listened to a lecture by Sean Carroll who gave a representation of "Strings" (as in string theory) by comparing them to a violin string.
He said "A violin string can vibrate in lots of different ...
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What can cause a steam condensate pipe to oscillate and is this normal?
I was visiting an industrial site not too long ago and I noticed an interesting phenomenon involving one of their steam condensate pipes. This (insulated) pipe was suspended from the ceiling. It ...
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Wavelength and Wavenumber not matching from Spectracalc [duplicate]
When I use Spectracalc.com to calculate the peak wavelength at 500 Kelvin, I am told the peak is at 5.79551 µm. When I switch the calculation result to wavenumber the peak is said to be at 980.506 cm-...
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1answer
31 views
Can electrons be ionised with a wave below threshold frequency but infinite amplitude?
Electrons of a certain atom can only be ionised with a wave with frequency above a threshold.
What if a wave's frequency was below the threshold but it had infinite amplitude? Because even though ...
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1answer
28 views
Understanding a resonance experiment
This article states that
If an object is being forced to vibrate at its natural frequency, resonance will occur
I can understand how this definition applies to a playground swing: if person A ...
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1answer
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How do I derive the frequency of oscillation of the capacitor voltage? [closed]
The formula is $$\omega= \frac{1}{\sqrt{L \times C}}.$$ How do I derive this?
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Is it possible to reduce the speed and frequency of a light wave to zero in a liquid medium?
Assume that two mirrors are located in a huge liquid medium – say, deep down on an ocean floor – with a refractive index of $n'$ as measured by an observer $A$ standing on the beach platform at rest ...
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2answers
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Questions about $\omega, f, \omega_{0}$ in harmonic oscillator
The motion equation for a mass-spring system is
$$x(t)=A\sin({\omega t+\phi})$$
where $A$ is amplitude and $\omega$ is vibration frequency. We have frequency value with $f$ and its inverse $T$. What ...
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1answer
28 views
How to increase the frequency of a water wave?
I am working on a piezoelectric device in a sea wall. Piezoelectrics take mechanical loading (like being squeezed) and can output an electrical signal. Unfortunately piezoelectric's don't work well in ...
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As with infrared pictures, would it be possible to see 2.4GHz waves as light?
I have seen many pictures of stars that were taken in the UV or IR spectrum. Others have pointed out that they are scaled down so as to map to visible elements within our capabilities. Could Wi-Fi ...
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Definition of 1 second [closed]
"One second is the time that elapses during 9,192,631,770 cycles of the radiation produced by the transition between two levels of the cesium 133 atom."
Can we alternatively define it as, Frequency ...
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2answers
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Can electromagnetic fields change the frequency of light?
Since light is an electromagnetic wave, can external EM fields change its frequency (through interference perhaps)?
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42 views
Forced Oscillations: What exactly is happening? [duplicate]
In a forced oscillation, what exactly is happening?
My textbook says that: The oscillator, initially, oscillates with the natural frequency. When we apply external periodic force, the oscillation with ...
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1answer
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Dependence of resonant frequency on the length of a ruler
Why does the resonance frequency of a ruler increase when the length is lower? I have a relationship from experimenting but I want to know why.
I have a vibration generator hooked up to the bottom ...
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Would visible light still be in a separate classification if we saw “colors” in a different wavelength? [duplicate]
Basically im asking if there's anything special about visible light other than the fact that we use it to see colors. If we saw in another wavelength, would it still be possible to see colors like we ...
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1answer
39 views
Can Zeeman effect occurs in gravitational wave from binary blackhole-magnetar merger
I understand that Zeeman effect is behind the splitting of spectrum lines in an atom in strong magnetic field, I was wondering if such phenomenon could occur outside electromagnetic wave such as from ...
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How to picture vibrational overtones of water?
Im trying to understand the colour of water. The absorption occurs because of some of the vibrational overtones of water.
The absorption band at 698 nm (14300 cm−1) is a 3rd overtone (n=4)
The ...
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1answer
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Amplitude change in SHM when velocity is changed
I came across this question:
A particle performs simple harmonic with amplitude A. Its speed is trebled at the instant that it is a distance 2A/3 from equilibrium position. The new amplitude of the ...
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1answer
21 views
Doubt about finding normal modes in Molecular vibrations
In the book introduction to classical Mechanics by Kleppner and Kolenkow, while dealing with the analysis of molecular vibrations in a poliatomic molecule, they propose the following method, in order ...
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1answer
50 views
In electromagnetic waves, what exactly do changes in frequency and amplitude do?
I recently learned about how lower frequency electromagnetic radiation is less harmful compared to photons above the ultraviolet type C frequency which have ionizing radiation because they contain ...
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3answers
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What happens when the amplitudes of interfering waves is different in the phenomenon of beats?
I had read that for the formation of beats, two waves must interfere such that they have similar frequencies but not identical, and their amplitudes should be identical. I don't understand why should ...
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2answers
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Why can you neglect the spring constant in the Hooke's law equation?
To explain, I'm doing an experiment that tries to prove the relationship of frequency being proportional to the square root of tension by measuring the string extension of a guitar strings I've ...
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1answer
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What is the relationship between the complex frequecy of a RLC circuit and the half power frequency of it?
First of all, I would like to apologize for possible mistakes in the writing of this text, since English is not my mother tongue and it is my first time in this blog.
Secondly, and more important, ...
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How to calculate plasma frequency?
i am wondering about Plasma frequency magnitude. According to the image i want to plot that graph.
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1answer
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Can someone explain how the frequency of a string relates to the tension?
and come to the conclusion that the The fundamental frequency of a vibrating string is directly proportional to the square root of the tension using equations please. This is for a lab i'm doing on ...
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1answer
49 views
Time Period of a periodic function
Consider the following periodic function:
$$ f(t) = \sin(ωt) + \cos(2ωt) + \sin(4ωt) $$
What is the time period of the above periodic function?
The following is given in my book:
Period is the ...
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2answers
50 views
Is it possible to converting electromagnetic waves to each other?
For example I have a source that emits X-Rays, is it possible to turning them into visible light or micro waves with the same energy as it was xray (I mean, can I change the frequency or the ...
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By just looking at the time period of the oscillation, can we know whether the motion is simple harmonic or not? [closed]
My questions are:
(1) By just looking at the time period of the oscillation, can we know whether the motion is simple harmonic or not? How?
(2) Is the same true for angular (circular) SHM?
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0answers
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Relation between energy, frequency and wavelength [duplicate]
Frequency $f$ and wavelength $\lambda$ of light don't alter after reflection. If that is the case, then energy should also not alter after reflection as $E=h f$. But energy gets altered after ...
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2answers
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Can the frequency of a wave change with respect to distance? Is there any phenomenon, or wave properties which can achieve this?
Want to know if the frequency of wave can be changed with respect to distance, is it possible either by using multiple interfering waves or any other way?
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What determines the frequency of a soundwave?
The frequency of a wave comes from the rate at which the disturbance at the source takes place. My question is, what parameters (on the guitar for example) determine that one string delivers a low ...
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1answer
137 views
Resonant frequencies in organ pipes
I have a series of doubts regarding the principle of organ pipes. For a given length of closed organ pipe there are various modes of vibration for the standing waves.I dont know if this is silly but ...
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1answer
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How does entanglement affect frequency shift?
Suppose you had two entangled photons, and dropped one of them down a gravity well. The dropped photon would blueshift, but would the entangled photon of the pair blueshift as well? Would it remain ...
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3answers
160 views
How can photons have frequency without vibration? [duplicate]
If photons have frequency then they must vibrate. So i was wondering, what kind of vibration do photons have? But according to physicists, photons do not vibrate. Can someone explain me, how is that ...
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1answer
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How does the change in speed of sound affect our perception of pitch?
Let’s say the speed of sound is 343m/s and thus the wavelength of the note with frequency 440Hz is about 0.78 meters. If I played the same note through a medium where the speed of sound was doubled to ...
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1answer
42 views
Time taken to determine source of a wave
I have a problem to solve. Suppose I have radiation coming at me from different sources, both with different frequencies, what would be the minimum time needed to find out where each source is coming ...
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1answer
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Wave Interference (Control Tower vs Mobile Phones)
I was curious about something regarding radio waves. When we're talking about differences of 200 MHz between waves, is there any way of any noticeable interference occurring? By noticeable I mean ...
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2answers
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Why is frequency a fundamental property of waves? [duplicate]
We are taught that although wavelength can change from one medium to other, frequency of a wave doesn't whenever Velocity varies in different media.
But why at a deep level, is frequency so ...
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How molecular simulation could be used to determine frequency-dependent electrical susceptibility?
Are there any frequency regions inaccessible to simulation?
Do certain frequency regions require special methods?
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Can a lower frequency receiver antenna receive information from a higher frequency signal?
End goal: I wish to use a smartphone NFC transmitter (high-frequency RFID @ 13.56 MHz) to send data to a low-frequency RFID @ 120–150 kHz door reader to open the door.
Illustrative example:
HF ...
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Can a Reverberation alter the fundamental frequency of reflected sound?
I am aware that different surfaces can filter out or boost some harmonic frequencies of a reflected sound. But would it be possible that some surfaces could alter the fundamental frequency of ...
