Question

What is the Tyndall effect?

Answer 1

In chemistry, Tyndall effect is referred to light scattering by particles suspended in a medium. The solution is basically a colloidal solution. This type of scattering is also called tyndall scattering. Tyndall scattering is the same as Rayleigh scattering. In colloidal solution, the individual suspended particles scatter and reflect light making the beam visible. The amount of scattering depends on the frequency of the light and density of the particles in the solution.

Complete step by step answer:
We need to know that under tyndall effect the longer wavelengths are more transmitted while the shorter wavelengths are more diffused due to scattering. Which implies longer wavelength light is transmitted, while shorter wavelength light is reflected by scattering.
When a beam of light passes through a colloid, the colloidal particles present in the solution do not allow the beam to completely pass through. The light collides with colloidal particles and is scattered. This scattering makes the path of the light beam visible. Generally, blue light is scattered to greater extent as compared to red light. As the wavelength of blue light is smaller than the wavelength of red light.

Note:
We have to know that the Tyndall effect is used in nephelometers to determine the size and density of particles in aerosols and other colloid matter. We can observe tyndall effects in milk. Milk is a colloid that contains fat and protein globules. When we direct a beam of light on a glass of milk, the light is scattered. If we observe it closely we can see a pale blue color. Another common example is fog, when we switch a torch in a foggy environment, the path of light is visible. The water droplets in the fog are responsible for scattering of light.