Waves are a very important concept in physics and are covered in almost every sub-discipline. Traveling and standing waves are plane waves of transmission lines.

The traveling wave is related to phase velocity, group velocity, phase delay, group delay, attenuation coefficient, phase difference, load impedance, and characteristic impedance, and the standing wave involves the wave node, wave belly, and amplitude.

Radio waves are a type of direct wave, and direct waves are logically related to the relative permittivity and relative permeability and diffraction.

First of all, let's look at the relative permittivity, which is easy to understand for both relative and constant. So, what about this dielectric? Under the action of an external electric field, an excess charge of the same sign appears at one end of the uncharged dielectric close to the charged body, and an excess charge of the same number appears at the far away end.

This is called polarization. The dielectric constant is a measure of the degree of dielectric polarization. And magnetic permeability can also be understood by analogy.

In language, gerund phrases and noun-verb phrases often interleave, giving the impression that there is no grammar.

The two seem to be interchangeable in meaning, but this is not the case. Here, no matter how you understand it, it's okay.

Directly speaking, it is the ability to turn on the magnetic field, and there is a taste of inverted here. We know that there are one-dimensional magnetic field lines in a magnetic field, so magnetic permeability can be further said to be the ability to conduct magnetic field lines.

What are the properties of direct waves? When a direct wave propagates in an isotropic atmosphere, its relative permittivity and relative permeability are equal to 1.

In other words, if the surroundings are anisotropic, the relative permittivity is small. The same is true for relative permeability.

If the environment has a ratio of isotropic degrees, the higher the ratio, the closer the values of the two ratios will be.

Crystals are anisotropic, so when a direct wave propagates in a crystal, the ratio of the two must be less than 1.

。 Since there are refracted waves and scattered waves, it means that the light waves are split when they propagate. We know that where there is light, there are light waves.

However, the question is how many light waves are there? According to the wave-particle duality, waves are particles, and particles are waves.

In this way, one photon corresponds to one light wave. Or that a photon is a light wave.

In this way, there are many light waves in a beam of light. Then, it's not the light wave splitting. Instead, some light waves become scattered waves and refracted waves.

But why do some light waves change and others don't? Since photons are not identical particles, there is a difference between the two photons.

This is equivalent to two light waves having a difference. However, the difference should be for all light waves.

However, why is there a local consistency in the behavior of light waves? Isn't there a difference in the light waves in these areas?

So, I think there's only one light wave of a beam of light. And this light wave is the entire photon that covers this light.

It's like the relationship between the node and the network. Light waves are wholes, while photons are individuals. Wave-particle duality says that the overall nature of light and the individual properties are entangled.

A light wave is a transverse wave precisely because it can undergo single-slit diffraction. And the gaps here are all parallel to the x-axis.

Seismic waves are both transverse and longitudinal, which means that they can be varied. However, I still have a question, isn't the vertical and horizontal symmetrical?

In other words, if you flip a horizontal thing, isn't it vertical? So, a reference is needed here.

Note that except for the speed of light, which is absolute, all other physical quantities are relative.