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JEE Main levelSingle correct optionDifficulty 2 of 3sc131

Brownian motion of colloidal particles becomes more vigorous when

Athe temperature is lowered and the particles are smaller
Bthe temperature is raised and the particles are smaller
Cthe temperature is raised and the particles are larger
Dthe viscosity of the medium is raised and the particles are larger

Answer: B

Higher temperature increases the kinetic energy of the medium molecules and so the force of their impacts. Smaller particles are displaced more by unbalanced impacts. Both changes raise the vigour of the motion.

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