b) Derive Einstein’s formula for mean square displacement of a Brownian particle.
To derive Einstein's formula for the mean square displacement of a Brownian particle, we first need to understand the underlying principles of Brownian motion and the statistical mechanics involved.
Brownian motion is the random motion of particles suspended in a fluid due to collisions with the fluid molecules. This phenomenon was first observed by the botanist Robert Brown in 1827. Einstein provided a theoretical explanation for Brownian motion in 1905, which played a crucial role in confirming the atomic theory of matter.
Let's consider a Brownian particle of mass \(m\) suspended in a fluid at temperature \(T\). According to statistical mechanics, the mean square displacement (\( \langle x^2 \rangle \)) of the particle can be related to its diffusion coefficient (\(D\)) and the time interval (\(t\)) through the equation:
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