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What does the product of collision frequency and transition probability yield?

(a) Number of transitions per particle per second

(b) Number of collisions per second

(c) Number of collisions per second per particle

(d) Transitions per collision

This question was posed to me in examination.

My question is based upon Vibrational Rate Equations in division Properties of High Temperature Gases of Aerodynamics

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The correct option is (a) Number of transitions per particle per second

Explanation: The collision frequency (Z) when multiplied with the transition probability (Pi, i + 1) yield the number of transitions per particle per second. Since the collision frequency is the number of collisions taking place per particle and the transition probability gives the number of transitions taking place per collision per particle.

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