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//Given that
R = 8.31 //in J/mol.K
Na = 6.023*10^23 //in /mol
K = R/Na
//Sample Problem 20-4a
printf("**Sample Problem 20-4a**\n")
T = 300 //in K
P = 1*1.0125*10^5 //in pa
d = 290*10^-12 //in meter
lambda = K*T/(sqrt(2)*%pi*d^2*P)
printf("The mean free path is equal to %em\n", lambda)
//Sample Problem 20-4b
printf("\n**Sample Problem 20-4b**\n")
v = 450 //in m/s
t = lambda/v
printf("The time between two collisions is %esec\n", t)
f = 1/t
printf("The frequency of collision is %eHz", f)
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