Sihai network

What is the Dindal effect? Light passes through the colloid to form a bright channel

Dindal effect is a common phenomenon in life. If a beam of light passes through the colloid, people can clearly find that there is a bright channel in the colloid that is different from the surrounding when the light is perpendicular. Let's learn about this effect together with our Xiaobian. What is the Dindal effect

Dingdal effect is also common in life. If the morning light comes in in a forest, people can also see a clearer channel from the side.

The Dindal effect was discovered by the British physicist John middot in 1869; It was discovered by dindar. It was originally found in colloids. This bright channel is mainly because colloidal particles successfully scattered light. It can successfully distinguish colloid and solution in physics.

The cause of tintdal effect

When the light is propagating, the light successfully irradiates on the particles. If the particles are many times longer than the incident light wave, the light will begin to reflect. If the particles are shorter than the incident light wave, light scattering will occur. If you observe carefully at this time, you will find that the light wave will surround the micro particles and emit light around, which is the so-called scattered light or milk light. The Tyndall effect is such a light scattering phenomenon, which can also be called milky light phenomenon.

Generally speaking, because the radius of real solution particles is less than 1 nm, the size of colloidal particles is in the middle of solute particles and turbidity particles in the solution. Generally, the radius is in the range of 1 ~ 100 nm, which is smaller than the wavelength of visible light. Therefore, when visible light passes through the colloid, a quite obvious scattering phenomenon will occur, but for the real solution, the scattering of light will be weakened because the volume of scattering particles is too small.

It is precisely because of the different performance of colloid and solution, that is, colloid has tintal phenomenon, but solution basically does not, so this phenomenon can better distinguish colloid and solution. In addition, through observation, it is found that the light path will also appear when the light passes through the suspension, but the particles in the suspension are too large to hinder the final light path, which is very short.

The concrete manifestation of Dindal effect

If in a dark room, a beam of parallel light looks at the transparent colloid through the eyes. If it is observed in a place perpendicular to the light, it can be clearly found that there are relatively turbid or even bright light columns, in which there are many tiny particles shining. This is the dingdal effect.

In the morning, in the dense forest, you may see a lot of light columns between the branches and leaves, which is also a Dindal phenomenon in the natural world. In addition to the Dindal effect, there are many interesting effects, such as Kondo effect and Compton effect. Those who are interested can continue to understand.