Why can we see through some objects? Opaque objects cannot?

Why can we see through some objects? Opaque objects cannot? First of all, transparency and opacity are aimed at visible light band, and electromagnetic waves of other frequencies need to be divided into specific situations.

Analysis.

Then let's analyze the reason for opacity, which is nothing more than that light waves are reflected or absorbed, in short, they are not transmitted. can

There are the following categories:

1, scattering, particle size. For example, the particle size of some materials can be compared with that of visible light, and there will be a great degree of scattering.

The incident light wave forms opacity. For example, "water vapor" is transparent as a gas, but thick "water vapor"

"There is opacity. It's because water vapor condenses into small water droplets and scatters all the light. So the clouds are opaque. small

The "colloid" composed of particles with light wavelength is transparent, and photons are not absorbed or scattered.

2. Conductors and metals contain free electrons. This difference has been discussed and will not be repeated.

3. Excited energy levels and absorption of molecules. Some materials, such as materials containing benzene rings or other organic or inorganic macromolecules,

The excited state energy level or vibration energy level of the molecule just corresponds to the visible light energy. Will strongly absorb visible light and produce visible light.

For this reason, many organic materials are opaque. If that organic molecule is small or large (

Polymer), the energy level is far away from the visible light band, and the structure is not complicated, so it will be transparent. Such as polyethylene plastic film. (this

It should be said that it is translucent, plastic thick or opaque)

4, a, pores, miniature black body (this is my own definition, don't joke; B, complex structure, mirror palace. there are some

The actual material structure is very complex or there are many micropores, and these micropores or complex structures are just like small ones.

"Bold", if you go in, you won't get out, which will also make the result opaque. This material is usually black. There are some materials.

The microstructure of materials is like countless small mirrors or prisms. It does not absorb light, but reflects and refracts all light. such

This material will be white. For example, transparent glass or ice, smashing a "white spot" on it should be this principle.

The opacity of actual materials is often the result of the above reasons. Such as wood, in which organic molecules.

It absorbs visible light, and the pores and fiber structure in wood are also the main reasons for absorbing and blocking the transmission of visible light.

As for why many materials are transparent, I can only say that they are opaque because of the above factors. For example, in glass

Silicon dioxide has no free electrons, and its molecular energy level is not in the visible light band. There is no complicated scattered light or absorbed light.

Structure and enough pores, so it is transparent. However, if you break glass or treat it as "ground glass"

There are many micropores, interwoven structures and tiny particles in the glass, which will be opaque.

To change a material from transparent to opaque, we can start with two factors: 1 and 4. Destroy its structure and form light absorption.

Porous and interlaced structures or "mirror palace" structures that reflect and refract light, or artificial scattering in materials.

Particles of light.

Why can't light penetrate opaque objects? Different substances have different effects on light.

Different substances have the characteristics of reflecting, absorbing and transmitting light of a specific color.

An opaque object is opaque because it absorbs all colors of light except its own color.

This is related to the microstructure of the object, not to say that it can be penetrated with high energy.

For example, red transparent glass can only transmit red light, and all other light is absorbed. Violet photons are more energetic and absorbed.

Why can sunlight penetrate transparent objects, but not opaque objects? The so-called "penetration ability" generally refers to the ability of infrared or higher frequency electromagnetic waves to forcibly penetrate opaque objects when reflecting the particle properties of wave-particle duality (wave-particle duality can be understood in quantum mechanics). The electromagnetic waves of the mouse can hardly reflect the properties of particles, but completely reflect fluctuations. On the premise of fluctuation, this definition of penetration is not used much. Please note that the transparency of different bands is different. For example, ruby is transparent to red light and opaque to blue light, while sapphire is transparent to blue light and opaque to red light. This is because ruby has a material structure that can react with blue light, while sapphire has a material structure that can react with red light. So the transparency here is not determined by the penetrating power of light, but by whether the substance can react with light of this frequency. Then your wall is transparent to the wavelength used by the mouse and opaque to light waves. This is normal. Because wall materials can react with visible light waves, but they can't react with electromagnetic waves of wireless mice. Of course, transparent objects also have transparency, and they are not projected by 100%, so the signal behind 1 1 floor is very poor. According to the wavelength of one-eighth meter, the diffraction effect is very poor for obstacles with a scale of more than a quarter meter.

Why is the color of a transparent object determined by the transmitted colored light? Why is the color of opaque objects determined by reflected light? You can't see the color of a completely transparent object.

Usually when we see an object with high transmittance, it is called a transparent object.

But at this time, they will still reflect, but the amount of reflection is small, accounting for a relatively low proportion of the whole light energy.

Our eyes all see reflected (or scattered) light energy.

So, your problem is that the color of transparent objects seems to be determined by the color of transmitted light, but what you actually see is the color of reflected light, and their transmission and reflection are all light of the same color and wavelength (that is, objects don't distinguish the wavelength of light at all).

It is easy to understand that the color of the reflected object is determined by the reflected (scattered) light.

Why can light pass through transparent objects? Why can light reach my eyes through transparent objects? Objects can reflect light more than green leaves. Green leaves absorb all kinds of light, while green leaves absorb less.

Transparent objects do not reflect all colors of light, and all colors of light are transparent.

Can shadowless adhesive bond opaque objects? Shadow-free bonding must have a transparent surface. You can use matte shadowless glue. You can contact Guangzhou Jiaohuang Company or contact me.

Can electromagnetic waves penetrate opaque objects? Alpha rays, beta rays and gamma rays can penetrate opaque objects.

Ray is a particle or photon beam with specific energy emitted by various radionuclides or atoms, electrons, neutrons and other particles during energy exchange. Alpha rays, beta rays, gamma rays and neutron rays are very common in reactor engineering. Because these rays are emitted from an endpoint in one direction infinitely, just like the rays in mathematics, they are called rays.

The first is alpha rays.

Also known as "a ray". It is a stream of alpha particles released by radioactive materials. It can be emitted by various radioactive substances (such as radium). The kinetic energy of alpha particles can reach several trillion electron volts. From the deflection direction of α particles in electric and magnetic fields, we can know that they are positively charged. Because the mass of alpha particles is much larger than that of electrons, it is easy to ionize the atoms in them and lose energy when passing through matter, so its ability to penetrate matter is much weaker than that of beta rays, and it is easy to be blocked by a piece of tissue paper or a hand, but its ionization is very strong. From the determination of the mass and charge of α particle, it is determined that α particle is the nucleus of helium.

Second, beta rays.

When radioactive isotopes (such as phosphorus atoms with a relative atomic weight of 32 and sulfur atoms with a relative atomic weight of 35) decay, negatively charged particles are released. Short range and strong air penetration. Ionization in organisms is stronger than gamma rays. β -ray is a high-speed electron current of 0/- 1e, with strong penetration and weak ionization. Originally, there was no distinction between left and right in the physical world, but there was a distinction between left and right in beta rays. In the process of beta decay, radioactive nuclei are transformed into another kind of nuclei by emitting electrons and neutrinos, and the electrons in the products are called beta particles. In the positive beta decay, a proton in the nucleus is transformed into a neutron and a positron is released at the same time. In negative beta decay, a neutron in the nucleus is converted into a proton, and at the same time an electron, namely a beta particle, is released.

Third, gamma rays.

Gamma ray, also known as gamma particle flow, is an electromagnetic wave with a wavelength less than 0.0 1 angstrom, which is released during the transition and transformation of nuclear energy level. Gamma rays have strong penetrating power and can be used for flaw detection or automatic control of assembly line in industry. Gamma rays are lethal to cells and are used to treat tumors in medicine.

I hope it can help you solve the problem.

Since X-rays can pass through opaque objects, why does the book say that light cannot pass through opaque objects? Is it contradictory? The light in the book refers to visible light, right

Visible light and x-rays are electromagnetic waves.

The wavelength of visible light is short.

X-rays have a long wavelength,

The longer the wavelength, the stronger the penetrating power, and the higher the energy of its photons, so it can penetrate.

Limited ability, for reference, thank you.

Can fish be raised with opaque things? Is it goldfish or transparent? It looks good. If it's not for viewing, it's ok as long as it's a container.

It is 2.5. Why do these opaque objects also have refractive index refraction, which is not a patent of light? Radio waves and X-ray waves may also refract when they encounter opaque objects or substances, so 2.5 points also have refractive index in the air.