# 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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### Wavenumber Equation Confusion

I have spent a frustratingly large amount of time grappling with this equation for wavenumber but I still don't understand. With the definition of wavenumber apparently being "the number of waves ...
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### What are the other ways to pass particular wavelength of light without using optical band pass filters?

I'm working on an experiment that have visible spectrum light source (RGB LED at e.g. 495–570 nm wavelength), holder with sample, narrow bandpass filter (eg: CWL:520nm, FWHM:5nm) and a photodiode to ...
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### What do the Bessel & Brett, Buser & Kurucz and Cousins filters evolution with time tell us?

I have been studying different filters to observe galaxies and I'm not sure I completely understand what information one can take from, in particular, the evolution of difference of intensity in the U-...
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### What is considered a wavelength?

What is considered a wavelength? I am getting confused here. I keep seeing one wavelength is the distance when the wave repeats itself. So at the two highest points that's the wavelength. Now I'm ...
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### What's the longest wavelength single photon we've ever observed? [duplicate]

At short wavelengths, our light detectors tend to be photon counters (e.g. CCD light sensor). At longer wavelengths, we use antennas and bolometers that tend to add up energy instead of counting ...
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### Can molecule displacement when increasing the amplitude be larger than a wavelength of a given sound?

I don't understand how these two quantities (amplitude + wavelenght) are not directly related to each other. If my understanding is correct amplitude is displacement thus distance, same as wavelength....
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### Why and how are wave sets (groups) created?

At a coasts wave normally arrive in groups (sets) and we wondered why this is the case. Some internet research did reveal some clues but no convincing answer. I want to know why waves gather in ...
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### Why do quantum effects of gravity become important at the Planck scale?

The standard heuristic argument for why quantum effects of gravity become important at the Planck scale is to consider the length scales at which both quantum field theory (QFT) and general relativity ...
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### Is a purely white light made up of an equal amount of all wavelengths of light in the visible spectrum? [duplicate]

I've heard that a blackbody radiator at 6500 K, for instance, emits pure white light, but does that mean it's made up of all wavelengths in the visible spectrum in equal proportions? Or is the ...
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### is current flow in open circuit with wire length=λ? [closed]

if ac source connected to resistor in open circuit as shown below: each wire length =λ/2(suppose wire resistance is zero) is current flow?
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### Is the decrease in wavelength proportional to the reduction in speed?

I conducted a small at home experiment where I compared a red laser’s wavelength through water vs air. I put a diffraction grating in water and then did the same out of water. See photo It was ...
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### Blackbody radiation, de Broglie equation, and lightwaves to be shifted left

I'm having a hard time figuring this out. Say we heated a lead ball to 1,000 Kelvin. Not all of the particles are at the exact same temperature--some parts are a little hotter, some are a little ...
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### Is there any quantum mechanics process in a prism?

Red light has longer wavelength than say blue light and so bends the least as it travels much faster in the same medium. My question is since energy is not stated in the above explanation, is QM ...
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### Doppler shift and speed of rotating objects in space

I understand the concept of how we can use the doppler effect to know if an object is spinning, in the sense that the part of the object spinning towards us will exhibit a blueshift, and the part ...
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### Why does energy loss cause end corrections?

Several people have said that end corrections occur because of acoustic radiation or something similar, where energy is used in vibrating the air outside the pipe. How exactly does energy loss cause ...
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### How is the relationship between the end correction and the pipe diameter related to acoustic impedance?

I know that Levine and Schwinger calculated the exact value of the end correction by doing something with the acoustic impedance but I don't understand their calculations. I've looked at paisanco's ...
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### Standing waves of a string

Why standing waves cannot be form from every frequency but only a particular frequency? I understand standing waves as a pattern that will be formed from one wave interfering with another, but i dont ...
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### Problem in grasping wavelength of light

I am having a problem grasping the concept of wavelength of light. We define wavelength as the minimum distance between two particles of a wave vibrating in the same phase , but in case of light there ...
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### Is Color Temperature and Wavelength the Same Thing?

I know that a higher color temperature is associated with cool light and a lower color temperature is associated with warm light (green and red) However I'm trying to understand the correlation ...
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### What is the wavelength of electrical current?

I am trying (as an exercise) to determine the force between two wires, in a similar nature to this question here. This suggests a solution based on the wavelength of the wave. However, the ...
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### Will a reflection phase change work regardless of wavelength?

If I have a gamma photon traveling in air and it shoots off towards a glass mirror and bounces off it, when I measure its phase, will it have changed by 180${}^\circ$? I was reading the wikipedia ...
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### Will overlapping two different beams of coherent light with different wavelength cause interference?

If I use two different wavelength lasers to transmit light into a single mode optic fiber will they interfere with each other? If so, how much will be that interference.
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### The color of a refracted ray

My textbook explains the cause of the refraction of light as the "difference between the speeds of light when passing from medium 1 to medium 2". The same textbook explains that the cause of the ...