Answer to Question #94268 in Physical Chemistry for Abhishek

Question

Explain the following phenomena and give their
cause :
(a) Brownian motion
(b) Tyndall effect

Answer 1

Solution.

Brownian motion - continuous chaotic motion of particles. With increasing temperature of the system in which the particles are located, the particle velocity increases. Consequently, the speed of Brownian motion is directly dependent on temperature. Examples: heating a gas cylinder or randomly moving pollen in a droplet of water.

The Tyndall effect is the glow of an optically inhomogeneous medium due to the scattering of light passing through it. This phenomenon is due to the diffraction of light by individual particles or elements of the heterogeneity of the medium, the size of which is much less than the wavelength of the scattered light.

Answer:

Brownian motion - continuous chaotic motion of particles. With increasing temperature of the system in which the particles are located, the particle velocity increases. Consequently, the speed of Brownian motion is directly dependent on temperature. Examples: heating a gas cylinder or randomly moving pollen in a droplet of water.

The Tyndall effect is the glow of an optically inhomogeneous medium due to the scattering of light passing through it. This phenomenon is due to the diffraction of light by individual particles or elements of the heterogeneity of the medium, the size of which is much less than the wavelength of the scattered light.