Physics · Statistical Mechanics
A large number N of Brownian particles in one dimension start their diffusive motion from the origin at time t = 0. The diffusion coefficient is D. The number of particles crossing a point at a distance L from the origin, per unit tim e, depends on L and time t as:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1N e-4Dt/L2
- 2N√16πDt3 e-L2/(4Dt)✓
- 3NL√4πDt e-4Dt/L2
- 4N√4πDt e-L2/(4Dt)
Correct answer
N√16πDt3 e-L2/(4Dt)
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