# 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 limit for passing of classical waves behind a slit?

For the classical waves is there a limit for them to pass through a slit when the dimentions of the slit are much smaller then the wavelength? I think that the Hyugence principle must be valid and ...
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### Is there any end to the electromagnetic spectrum? [duplicate]

Is there any theoretical end to the electromagnetic spectrum…
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### What is the wavelength of light in a practical sense?

Okay, so I know that a wavelength is a distance of crest and a trough added together which makes a whole wave, but what is it in the real sense? Like in the case of sound I know when we say "...
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### Does microwaves nevertheless pass through smaller slits?

It is known that the Foucault currents prevent the microwaves to leave a microwave oven (MWO). The waves can not pass tru several times smaller openings than their wavelength because the grid of the ...
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### What happens to the time period when refraction occurs? [duplicate]

I was studying light and had a doubt that when refraction occurs (rarer to denser just assuming) then frequency remains same but lambda (wavelength) and velocity decrease. But I cant quite figure out ...
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### Can you explain me the definition of wave number as defined in theoretical physics?

Wavenumber, as used in spectroscopy and most chemistry fields, is defined as the number of wavelengths per unit distance. The corresponding formula is $$k=\frac{1}{\lambda}.$$ However, in theoretical ...
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### Huygens principle and small aperture

Does Huygens principle depend on the ratio of the wavelength and the dimension of the aperture? Do waves extinguish themselves by ratio 10 or more due to interference, e.g. will the wave pass through ...
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### Number of Fringes obtained on Interference of Lights of different Wavelengths

The Question goes as follows: I am stuck at the part where we obtain General Equation for Path Difference of two Interfering Lights. Since Wavelength of those Interfering Lights are different, so I ...
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### Are gamma rays the limit of the frequency photons can attain, and if yes, why? [duplicate]

Recalling that the Planck constant is $6.62607015 \times 10^{-34} m^2kg/s$ and taking into account the formula $E=hf$, for the energy of photons, we can rapidly derive the energy of gamma rays, which ...
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### Light as a wavelength [closed]

I am learning that light is an electromagnetic wave, does this wave travel in every direction simultaneously from the source of light? I am trying to visualize this concept but I haven’t seen an ...
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### From discrete to continuous superposition of waves, what happens to omega?

The Wikipedia page on group velocity uses the superposition of two cosines (of slightly different wavenumbers and angular frequencies) to show that group velocity $v_g = \frac{d\omega}{dk}.$ The sum ...
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### Frequency and length

Why is pitch inversely proportional to length of an instrument? I think i know meaning of frequency but if anyone can also explain frequency according to higher level physics it shall be great.
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### Is there a name for this type of wavevector?

When we say wavevector we often mean a vector $\mathbf k$ that is related to the direction and wavelength of a plane wave, given by $e^{i\,\mathbf k\cdot\mathbf x}$. I have to write something about ...
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### EM scattering cross section, antenna directivity and its interpretation

The formula (35.25), see Slater, $\bar A_r = \frac{\lambda^2}{4\pi}$ is probably the most important formula in radar and/or antenna engineering. It says that the average absorbing cross section of ...
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### Sound of string in a guitar

I study about waves and I learn that the velocity of a transverse wave in a string depends only on the tension and the density of the string. The frequency depends only on the source (whatever ...
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### How does thermal wavelength work exactly?

In many sources it is stated that the thermal wavelenth indicates the rough size of the atom. It is then stated that this wavelenght is the de-Broglie wavelength of a particle with a momentum with the ...
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### If a human was moving fast enough how bright would the blue-shifted heat be? Would it be detectable by an average human eye on an average night?

I guess another way to answer this question would be if our eyes had the capability to detect the peak black-body wavelength that is emitted by humans would it be enough radiation to detect if we were ...
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### Why does not the speed of sound in air depend on frequency and wavelength? [duplicate]

I have read that speed of longitudinal waves depends upon the frequency and wavelength and, but why it doesn't happen with sound waves in air? And if velocity of sound doesn't depend upon the ...
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### Why is the resolution of a tunneling microscope not limited by the wavelength of the electrons?

Why is the resolution of a tunneling microscope not limited by the wavelength of the electrons? Is it impossible for the electrons that are tunneling across the gap to appear somewhere in the gap, ...
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