Everything about The Tyndall Effect totally explained
The
Tyndall effect is the effect of polarity
scattering on the equilibrium of molecules in
colloid systems, such as
suspensions or
emulsions. It is named after the 19th century Irish scientist
John Tyndall. The Tyndall effect is used to tell the difference between the different types of mixtures, namely
solution,
colloid, and
suspension. For example, the Tyndall effect is noticeable when car headlamps are used in
fog.
The light with shorter wavelengths scatters better, thus the color of scattered light has a bluish tint. This is also the reason why the
sky looks blue when viewed away from the sun: the blue light from the sun is scattered to a greater degree and is therefore visible far from its source. This effect occurs because short
wavelengths of light towards the blue end of the
spectrum hit the air molecules in the earth's atmosphere and are reflected down to the earth's surface. Longer wavelengths towards the red end of the spectrum are less affected by the particles and pass on through the earth's atmosphere.
Blue light scatters more readily than does red light. At sunset the pathlength of the light through the atmosphere is larger than at any other time of day, and is sufficiently long that the blue components of the light have undergone multiple scattering events such that the intensity at such a great viewing distance is minimal. Due to the prolonged pathlength, the red light shows obvious scattering effects as observed by the sky appearing different hues of red. The red light is visible only at such great distances through the atmosphere because it's less affected (scattered) by the particles of air than the blue light, which is no longer visible.
The Tyndall effect is more commonly referred to as
Rayleigh scattering in introductory physics text books.
Further Information
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