# 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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### Light and transparency

As we know, light is reflected by a mirror, so we can see our image, it is mostly reflected by a white wall (that does not get hot) but we cannot see our reflection, it is absorbed by a black wall, ...
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### How could I measure the colour spectrum of a light bulb and investigate how closely it matches a black body radiation curve?

Here is my research question: What is the colour/spectrum produced by each globe type? What is the temperature equivalence? How closely does a globe match a black body radiation curve? I will be ...
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### How can a wavelength be defined for a laser where a photon's travel distance over a pulse duration is less than a wavelength?

Femtosecond laser pulse are widely used in experimental physics. Femtosecond lasers like Nd:YAG systems produce coherent light at wavelength 1053nm. The distance traveled by a photon in 1 fs is 300nm; ...
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### Proof of de Broglie wavelength for electron

According to de Broglie's wave-particle duality, the relation between electron's wavelength and momentum is $\lambda =h/mv$. The proof of this is given in my textbook as follows: De Broglie first ...
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### Wavelength-division multiplexing (WDM) and white light spectrum wavelengths differ

I am a newbie to Optical fiber communications and was going through the article on WDM on wikipedia here: WDM Wikipedia I also went through the below article on prism diffraction of white light into ...
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### Unable to get the correct wavelength for the Lyman-alpha transition in Positronium

I am tasked with the following question: Positronium is an exotic atom consisting of an electron and a positron (its antiparticle). What is the reduced mass ...
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### Is the event horizon of a black hole wavelength-specific?

The event horizon is the boundary surrounding a black hole from which not even light can escape. There's a certain negative potential energy level associated with the event horizon. Now, some shorter-...
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### Conditions for forming a stationary wave?

Does it only require two waves of the same frequency / wavelength travelling in opposite directions? My teacher says that one wave needs to be reflected and then superimpose with this reflection for a ...
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### Derivation for wavelength bandwidth

I've been told that for wavelength bandwidth $\Delta\lambda$, it can be shown that: $$\Delta\lambda = \frac{(\lambda^2 \Delta\nu)}{c}$$ Where $\Delta\nu$ is the frequency bandwidth and $c$ is the ...
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### Does the continous EM spectrum contradict discrete energy? [duplicate]

After some research, it seems apparent to me that the EM spectrum is continuous, but this would contradict a physics fundamental that energy is discrete. Is there a conflict here?
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### What phase of an electromagnetic wave is the ground state?

I have read that the uncertainty principle applies to electromagnetic radiation, and the ground state could not be sitting on the lowest energy point, because then it would have definite position and ...
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### Can a radio station's wavelength be measured by driving through its interference?

The other night, while driving I was listening to KGO radio. KGO is a San Francisco AM station that broadcasts at 810khz. I was driving north, away from the station, at about 70mph. I notice that the ...
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### What causes color change on the surface of blade in picture?

What causes this color distribution in the knife shown below? A chemical that causes light to change wavelength? A product of the heating process?
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### Are we exposed to more blue light than any other colour?

it's my first post so nice to meet you all. Is blue light more abundant on the Earth's surface than any other colour? I know that if this is extended to non-visible EM radiation then radio waves are ...
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### Why does electron orbital circumference have to be in multiples of de Broglie wavelengths?

Electron orbit circumferences have to be in multiples of its de Broglie wavelength, but what do those 2 have in common?
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### Can the wave length of a photon be stretched out caused by expansion of spacetime? [closed]

Strictly speaking perhaps it is not right to say that a photon is a wave so its wave length can't be stretched out; a photon is actually just a point. So is its wave property only a relativistic ...
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I'm trying to learn wave mechanics and came across the equation that states wave as a function of $x$ and $t$ and specifically $(kx - \omega t)$. In my faulty imagination, the $kx$ is always equal to $... 1answer 243 views ### How far do electrons go in an antenna? Do you know what is the distance electrons cover in an antenna during the production of a radio wave? Does the extension of the oscillation vary with the frequency or the power of the radiation? Is ... 1answer 658 views ### Does redshift only affect particles of visible light? May seem really daft but I don't know of any ways of detecting redshift in the rest of the EM spectrum, so was just wondering 1answer 97 views ### Why car tail lights look red? The car's tail light is made from red plastic material, and when the bulb from the inside switches on we see red colour, why? Is it just that the bulbs light illuminates that red plastic or wavelength ... 1answer 3k views ### Can a rainbow be seen from above I saw this picture of a "rainbow from above" Based on what I understand about rainbows, some googling and my experience chasing them, if I saw one and try to fly above it, the phenomenon will ... 0answers 918 views ### Single slit diffraction pattern for electrons? Reading about Young's double slit experiment for electrons, it is stated that the diffraction pattern is observed when both slits are open but not for a single slit (I suppose this is equivalent to ... 1answer 90 views ### How to take measurements for wavelength in an experimental wave tank? To anyone familiar to the experimental hydrodynamics field, how does one experimentally measure the wavelength of the waves generated in a plunger type wave tank or any wavetank for that matter. From ... 1answer 155 views ### electromagnetic waves:$ f(t) = A \sin(Bt) \$ [closed]

I recently saw this question which was slightly lacking in formulation, but I was still interested in solving it; but I can't. Light can be seen as electromagnetic waves, which in vacuum, moves ...