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Time taken for the number of collisions depends on which of these parameters?

(a) Molecular collision frequency

(b) Molar density

(c) Number of moles

(d) Boltzmann constant

The question was asked in final exam.

Query is from Introduction to Nonequilibrium Systems in chapter Properties of High Temperature Gases of Aerodynamics

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The correct choice is (a) Molecular collision frequency

To explain: The amount of time taken by the molecules for collision depends on the molecular collision frequency. Thus parameter tells how many collisions take place with a neighboring particle in a second for a single particle.

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