CBSE Class 10 Answered
Mean free path of cosmic ray proton in water at 4oC is λ. If water is cooled to 0oC,
then the change in mean free path in water
Asked by chandubeats21 | 19 May, 2017, 08:30: PM
Expert Answer
Mean free path is the average distance travelled by a particle between successive collisions. Water has highest density at 4 °C. Its density at 0 °C is less that that at 4 °C. Hence, due to less density the chance of a collison is less. So, the average distance between collsion, i.e. mean free path increases. Hence, at 0 °C mean free path is greater than λ. Therefore, the change in mean free path is positive.
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