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Questions tagged [wavelength]

The wavelength of a sinusoidal wave is the spatial period of the wave—the distance over which the wave's shape repeats, and the inverse of the spatial frequency or wavenumber. Determined by considering the distance between consecutive corresponding points of the same phase, such as crests. Use for wavenumber, wavelength, frequency.

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Derivation of the de Broglie waves for a relativistic particle

Generally speaking I am looking for the derivation of the de Broglie waves for a relativistic particle. The particle is in electric field potential ($U$) which accelerates the particle as well. Let's ...
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Phase difference in a standing wave?

What would the phase difference between P and Q be? I assumed that because they are 1/4 of a wavelength apart, it would be Pi/2, but supposedly the difference is 0.
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Finding the wavelength of a radio wave [closed]

I've been given that a radio wave travels at $1230 \text{kHz}$ $(1230 \times 10^3 \text{Hz})$ I simply had to find the wavelength of the radio wave, since a radio wave travels at $c$. I simply set ...
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Why use ultrasound for medical imaging? [closed]

What advantage does ultrasound have over sound between 20-20000Hz that it is used in medical imaging over sound in that frequency range?
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How do you combine wavelengths of particles in an atom?

As the problem below results in the wavelength of a single electron, how would this combine/interact with other particles? In an atom, for example.
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When a valence electron is excited, how fast does it move from ground state to excited state?

Imagine an atom with a valence electron becomes excited and the electron moves to a higher orbital, is this transition between ground state and excited state at speed of light? If so, since it is not ...
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Energy levels of electrons in an arbitrary element?

Let's say I want to calculate the wavelength of the photon emitted when an electron of an arbitrary element (let's say Carbon) drops from $n=4$ to $n=3$. Correct me if I'm wrong, but I think I would ...
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Why is the extent of scattering of light by particles inversely proportional to the fourth power of the wavelength of the light wave?

When I first came across this, I speculated this law is experimental. However, later I came to know that this is not the case. A concise answer, with some reasoning as to why the negative fourth power ...
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Laser Detection Paint

Does there exist a paint which if a pulsed laser of ~1500-1600nm was fired at it it would emit visible light or IR Radation (3-5 micron)? I have seen up-converting inks and paints but I can't find ...
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Hypothetical maximum energy of a single photon [duplicate]

I'm no physicist so it might be a stupid question but is there a maximum energy a single photon can have? My idea was, that there might be restriction for the minimum wavelength and I thought about ...
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If white light were split through a prism, would it emit more wavelengths than are contained within the visible light spectrum?

If white light was refracted through a prism, creating the colors of the rainbow, would it also create wavelengths of light in the infrared and ultraviolet range, which fall in the non visibility ...
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Dimensions of Faraday shielding mesh

Why should the spacings of the wires that constitute a Faraday cage be smaller than the wavelength of the radiation we wish to prevent from penenetrating inside the cage?
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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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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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Is there a resolution limit to electron microscopes?

Is resolution limited only by the wavelength of the electron? Because then I would presume there is no limit to resolution as you could lower the wavelength of an electron by increasing the voltage of ...
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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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Energy of light

If a beam of light is travelling in full vacuum in same medium ,then , the energy of the light beam will decrease or not while moving through space ? The wavelength of the beam of light will change ...
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What happens when the wavelength of light becomes as large as the observable universe? [closed]

Say the wavelength of a photon became so large that it approached the size of the observational universe. Does something unexpected happen?
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Why does a stable orbit of $H$ atom contain an integer number of de Broglie wavelengths? [duplicate]

I was trying to understand why a stable orbit of a hydrogen atom has to satisfy that the orbit length must be a multiple of de Broglie wavelength. I have seen some related questions like This. But ...
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Which device to measure UV lamp wavelength with high precision

Which techniques and devices are able to measure the wavelength/frequency of a UV lamp within the wavelength range of 50nm - 300nm? Is a VUV Optical spectrometer the right device for this?
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Wavelength of black color

In absence of visible light when we see any object or space to be dark (black), What is the wavelength we encounter so that the object or space looks dark to us?
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Wavelength to RGB [closed]

I don't know how to convert $xyz$ chromaticity coordinates in sRGB. For example in What {R,G,B} values would represent a 445nm monochrome lightsource color on a computer monitor? the author takes: $$...
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How wide does a door have to be for a cat running through it to interfere with itself? [closed]

A cat runs through a door. Assuming h = 1 J s, mass of the cat is 1 kg, and the velocity of the cat is 1 m/s. Assume the cat is a quantum particle. How wide does this door have to be for the cat to ...
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Why wave graphs sometimes use space and sometimes time?

On some graphs representing waves, the horizontal axis is marked as space (x), on other graphs the horizontal axis is marked as time (...
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Wave-like properties of particles [duplicate]

If we consider a particle such as an electron to have wave-like properties too, what kind of wave it is? What is exactly meant by its wavelength?
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Reference Frames and the De Broglie Wavelength

If the de Broglie wavelength of a massive particle, is h/mv then doesn't that mean interference patterns and everything change their properties depending on the velocity of the observer? How can QM ...
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Reflection by a mirror of wavelength type dimensions

Suppose there is a perfectly reflecting mirror, which is somehow made to the size of wavelength is visible light. Will there be any reflection now, or will it act in some other way? I thought there ...
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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 ...
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Why the cycles completed by standing wave completed by electron in a certain orbit is same as principle quantum number?

According to the bohr model and de-broglie hypothesis why the cycles completed by standing wave completed by electron in a certain orbit is same as principle quantum number? When we derive the ...
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Why must I solve the de Broglie relationship in a single dimension instead of all three?

Context: a particle of mass $m$ can move in 3D and is trapped inside of a sphere of radius $R$ and impenetrable walls (in a more mathematical sense, the potential energy is 0 inside of the sphere and $...
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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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1answer
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Calculate the length of the string if it is vibrating at the 4th harmonic [closed]

The statement is as follows: The function that describes a standing wave on a fixed string at both ends is given by $y(x, t) = 2A \sin (kx) \cos (\omega t)$, where $A = 1.5\ \mathrm{cm}$, $k = 0.3\ ...
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How do LF Radio waves send data?

Excuse me I am a complete beginner. If LF radio waves are sent with let’s say frequencies of 100 kHz, how can data be modulated to that signal considering the signal is so long? For example, how can ...
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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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1answer
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How does spot size of a laser depend on wavelength?

Does the spot size of a laser depend on wavelength? We have a laser source that is fed into a spectrometer to set the wavelength we want. No other optics are used after the spectrometer. I was going ...
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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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De Broglie Wavelength of a particle at the turning point of a fountain

If you think about an atom which is launched in some kind of straight fountain, upward in the gravitational field. At the turning point the velocity and therefore the momentum of the particle seems to ...
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What are the factors on which wavelength of X-rays depends upon? [closed]

So the thing is that I was learning about X-rays and I came across this line that minimum wavelength of continuous X-ray spectra depends only upon Anode voltage about which I'm sceptical because $$eV=...
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Wavelenghs less than Planck Length [duplicate]

Okay all you heavy physics people, be nice. I'm a retired layperson doing some reading. My question is this : at present technology, can we detect (even if we can't measure precisely) wavelengths ...
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What happens when the DeBroglie wavelength becomes smaller than the Planck length?

A particle around the size of a grain of salt would have a DeBroglie wavelength close the plank length. Does this mean quantum phenomena become hidden for larger particles since a DeBroglie wavelength ...
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Can an electron pass through a gap smaller than an electron?

If an electron (photon) can pass through a gap smaller than an electron (photon) then it is a wave otherwise it it a particle. Is this a correct way of reasoning?
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Why do hot objects tend to emit shorter wavelength? [closed]

So how do the temperature and wavelength related and why do hot objects tend to emit shorter wavelength?
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Why are bend losses higher at higher wavelengths in fiber optic cables?

I have been researching the effect of wavelength on macro-bend losses for my extended essay (a 4000 word paper on a subject of your choice, high school level) on fiber optic cables. I asked this ...
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Efficient generation of infrasound

It seems that the most common sources of infrasound are earthquake, tsunami, volcano eruption, etc, which are all large scale behaviors. Why is it difficult for a human to generate infrasound? Is ...
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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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Looking for something to reflect ultraviolet light at extremely low wavelengths [closed]

I am looking for some sort of mirror that will reflect ultraviolet light at extremely small wavelengths (200-250 nm). The main purpose of it is to amplify the ultraviolet light and cause it to spread. ...
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1answer
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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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How do we know electron have wavelength?

I know many people thought that light is a wave in the past before Einstein came along but what about electron, the scattering experiment could only hint at their existence so how do they know that ...
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Does glass convert light wavelength?

I heard that when sunlight enters house through windows, it gets converted into longer wavelengths and gets trapped inside. So does the glass have anything to do with this or is this about heated ...
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Wavelength and relativity

From de Broglie equation λ=h/p. But p=mv and velocity is a relativistic quantity so also wavelength is relative ? In other words does wavelength depends on the reference frame ?