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a solid four inch cubed block of material like black carbon
Can the wavelength, and frequency of any EM wave be increased, or decreased, as the waves pass through a solid four inch cubed block
Could it be done, basically to make the (material) translucent by 2%, even temporarily?
As I understand it, the frequency can't be changed, but the wavelength can, when passing through a "linear" transparent optical material like glass, or your eyeball. This is how glasses and your eyeball can focus light.
Quote from: evan_au on 25/04/2016 00:29:45As I understand it, the frequency can't be changed, but the wavelength can, when passing through a "linear" transparent optical material like glass, or your eyeball. This is how glasses and your eyeball can focus light.This is really quite mystifying because IF the speed of light slows down when moving through a medium AND the frequency remains the same, then the wave-length should decrease not increase:
The amount the wavelength is compressed is determined by the index of refraction of the material.
the conclusion that the frequency of light remains unchanged while its wave length increases with its passage through a medium is wrong
The amount the wavelength is compressed is determined by the index of refraction of the material.By saying that the wavelength is "compressed", I tried to imply that the wavelength is shorter when light is travelling through a material of higher index of refraction.This agrees with the numerical example provided.(overlap with Colin2B...)
If the wavelength changes , the frequency changes. The two are inextricably connected.
Sorry to sound contentious BUT if you are speaking in terms of electromagnetic radiation travelling through a medium, then surely if the wave-length is compressed, the light that entered the medium won't be the light that comes out, different wavelength, different frequency.
If you mixed any invisible EM waves, like X-rays , gamma waves, ultraviolet waves ,and micro waves with radio waves, and sent the invisible EM waves in microscopic bundles with the original radio wave beam.So basically the EM waves are intertwined into a single beam, the the beams that absorb are in microscopic bundles, they could be sent even into the carbon cubed four inch block of matter in millisecond timed bursts.
There appears to be a misunderstanding here.Light that enters a denser material (eg Flint glass, refractive index 1.61) is slowed down by a factor of 1.61, and it's wavelength is compressed by the same factor of 1.61, while its frequency remains constant.
The photon point of view which is that light slows due to emission and absorption
Quote from: McQueenThe photon point of view which is that light slows due to emission and absorptionCarbon (graphite), with its many connected atoms in many structures has a wide conduction band, and absorbs photons over a very wide range of frequencies.In contrast, glass is a non-conductor, and does not have the same broadening of energy levels in its electron orbitals. The atoms and molecules of pure glass do not have energy levels which absorb and re-emit real photons in the visible range. That's why it is transparent.I can't comment on virtual photons...https://en.wikipedia.org/wiki/Transparency_and_translucency#Introduction
derisive reference to 'virtual photons'
if light is slowed energy is involved, if energy is involved then photons not waves are involved.
Can EM waves like radio waves that can traverse solid matter, be combined/mixed with other EM waves to become EM waves that get absorbed by electrons?
I'm sorry if my reference to virtual photons offends you. Some people take virtual photons very seriously, in the context of light propagating through media.
Please clarify why light waves, ocean waves, gravitational waves and radio waves cannot carry energy.