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यदि किसी गैसय के अणुओं की त्रिज्या `r` हो तो उनका माध्य-मुक्त पथ व्युत्क्रमानुपाती होता है:
A. `r^(3)`
B. `r^(2)`
C. `r`
D. `sqrt(R)`

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Correct Answer - b
माध्य-मुक्त पथ `lamda=1/(sqrt(2)pid^(2)n)`
अतः `lamda prop 1/(d^(2))`
अथवा `lamda prop 1/(r^(2))`

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