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The phenomenon of scattering of light by the colloidal particles gives rise to:
delay in sunset
Tyndall effect
rainbow
twinkling of stars
Tyndall effect
The Tyndall effect is the phenomenon in which light is scattered by colloidal particles as it passes through a colloidal solution. This scattering causes the path of the light beam to become visible.
The Tyndall effect is the phenomenon in which light is scattered by colloidal particles as it passes through a colloidal solution. This scattering causes the path of the light beam to become visible.
Think of a dusty room in the afternoon; when a beam of sunlight enters through a window, you can clearly see the dust particles dancing in the light. This visible 'path' is the Tyndall effect caused by the dust (colloidal particles) scattering the sunlight.
IтИЭ╬╗41тАЛ тАФ Rayleigh scattering intensity is inversely proportional to the fourth power of wavelength
When a beam of light passes through a colloid, the colloidal particles are large enough to scatter the light in different directions. This is distinct from a true solution, where particles are too small to scatter light, and a suspension, where particles may cause reflection or absorption. The intensity of scattering depends on the frequency of the incident light and the size of the particles (Rayleigh scattering regime).
It occurs in colloidal solutions.
The path of light becomes visible in the medium.
Blue light is scattered more than red light due to shorter wavelength.
Used to distinguish between colloidal solutions and true solutions.
Seeing the path of headlights in fog.
Canopy of dense forests showing light rays (Tyndall beams).
A true solution (e.g., salt water) does not show the Tyndall effect.
Wrong options explanation: 'Delay in sunset' and 'Twinkling of stars' are due to atmospheric refraction. 'Rainbow' is due to dispersion, refraction, and internal reflection.
B is correct тАФ The phenomenon of scattering of light by colloidal particles is known as the Tyndall effect.
Remember that refraction is about 'bending' of light, whereas the Tyndall effect is purely about the 'scattering' of light by particles.
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