# 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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### Is there a discrepancy between deBroglie's equation and the standard electromagnetic spectrum chart?

I learned that the wavelength of any particle, but particularly a quantized particle, is proportional to its momentum; that is to say, small particles have large wavelength properties and large ...
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### How can i add one wave to another? Is the the first waves amplitude different from the seconds? [closed]

There are two tuning forks, one having the frequency equal to 460Hz, second one having the frequency equal to 464 Hz. They are hit simultaneously. Adding the first wave to the second one what is the ...
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### Can the energy of a photon be increased, thereby decreasing its wavelength and increasing its frequency?

I know about Inverse Compton Scattering, but is it theoretically possible to take photons with frequencies so low they cannot be detected, increase their energy and hence make them detectable?
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### Why don't we observe quantum effects for large massive objects at rest? [duplicate]

The de Broglie wavelength of any massive particle is $\lambda = \frac{h}{p}$. We know that if a large object (say, a baseball) is at rest, it will have $p=0$ and hence $\lambda$ will be infinite. This ...
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### Wavelength of reflected light vs transmitted light [closed]

In the basic setup of the experiment below, the transmitted light is used to infer the absorbed wavelengths. The explanation of the experiment states that a high transmittance reading for a specific ...
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### How to explain mobile phone rings inside microwave oven?

So finally tested myself and found: mobile phone rings inside microwave oven. Microwave oven frequency is 2.5 GHz which gives wavelength of 12 centimeters. Cellular network waves are even longer. Thay ...
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### Could we see through objects if our eye could detect other wavelengths of light?

We see objects around us because light reflects off the surface and enters our eye. So if our eyes could see a wider range of the spectrum (maybe lower wavelength as they would scatter less) then ...
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### Is there any way to differentiate UV light from visible or IR light?

I'm working on a small sensor system that responds to only UV light and I wanted to know that is there any way to differentiate between UV light and the rest of the spectrum like using lens if so then ...
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### If most types of practical lasers produce a large number of half-wavelengths, then how are they practical for use at all?

I am currently studying Laser Systems Engineering by Keith Kasunic. Chapter 1.2.1 Temporal Coherence says the following: Axial (or longitudinal) modes are determined by the geometrical fit (or ...
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### DoubleSlitExperiment: Will a laser beam in front of the slit dramatically change the trajectory of the incoming electron?

Let say we believe that we can get 'which-path-information' so put a laser beam of best matching frequency in front of only one of the two slits so it can deflect the electron in direction the laser ...
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### Converting one form of Plancks law to another [duplicate]

Wikipedia says: ...the spectral radiance of a body, B, describes the spectral emissive power per unit area, per unit solid angle for particular radiation frequencies. The spectral radiance of a body ...
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### Changes to an EM-wave that is propagating in an inflating space

I am trying to get an easier picture of what happens to an em-wave considering space expansion. My question is: If a star in a non-inflating space emits light recorded at a certain distance of the ...
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### Where to use $E=h \nu$ and $p=h/\lambda$? [closed]

Where to use $E=h \nu$ and $p=h/\lambda$? Because both the methods give different answers. Can somebody explain why is it so?
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### Differentiating $\nu = \dfrac{c}{\lambda}$

I am currently studying Laser Systems Engineering by Keith Kasunic. Chapter 1.2.1 Temporal Coherence says the following: The coherence time $\tau_c$ over which the emitted wavelengths are considered ...
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### Why is the color of light not associated with frequency?

Imagine a green light source is at the center of a transparent material sphere and I am staying in the vacuum (or air) and looking to it. Now imagine that the wave length of the this light increases ...
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### Why is the phase difference an “odd number of half-wavelengths” when two waves interfere destructively? [duplicate]

Excerpt from the Feynman Lectures, Volume III, Quantum Behavior (emphasis mine): At those places where the two waves arrive at the detector with a phase difference of π (where they are "out of ...
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### What can we expect to observe if we were able to observe de Broglie wavelength of massive bodies?

I have seen the famous question where they ask us calculate the de Broglie wavelength of a moving ball but it comes out to be too small and hence we conclude that it is too small to measure by known ...
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### Planck`s law for an interval of wavelengths

Planck's law for spectral radiance of a black body for a wavelength: $$P=\frac{2hc^2}{\lambda^5}\frac{1}{e^{hc/\lambda k_bT}-1}$$ If I want to know the spectral radiance for an interval of wavelengths,...
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### What does momentum of Photons mean? [duplicate]

I have already checked out Can a force stop a Photon since Photons have momentum and What does momentum mean when talking about massless particles?, but that didn't answer my query. I already know ...
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### How do Fluorescent molecules emit light in a different wavelength than the one needed to excite them?

if it took a very certain amount of energy to excite an atom, how come when it de-excites it emits a photon of lower energy? I know that's what scintillators do, I Just want to know the microscopic ...
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### How Small a Slit can Light Pass through?

If you imagine light source passing through a single slit of variable thickness, as you lower the thickness of the slit the light will diffract more and more until the slit is small enough that no ...
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### Signal reflections on conductors at low frequencies where they are not transmission lines

This question might be suited for the Electrical Engineering forum, but I think I might get more scientific explanation/discussion (rather than anecdotal) on this forum. Is the reflection phenomenon ...
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### Wavelength of an electron in a magnetic field

I came across a problem in which I was asked to find the magnitude of a magnetic field, if an electron was projected into it with a certain velocity perpendicular to the Direction of the field, and ...
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### What is wavelength? [closed]

I know that wavelength is the distance between corresponding points of two consecutive waves. It is the distance over which a wave repeats its motion. But I am unable to understand what is actually ...