618 The Kinetic Theory of GasesP21.46The average molecular speed isvkTmkNTNmvRTMvvBBAA====⋅×=−8888 8 3143 00178πππ..JmolKK2.016 10kg molms3bgej(a)The mean free path isAA×=×−1212020010563 1029218dnV..m 1mm3The mean free time isAv=×=×3 17 101 00 1018169.m178 m ss yr.(b)Now nVis 106times larger, to make Asmaller by 106times:A12. m.Thus, Av=×3 17 101 00 10103yr.P21.47From Equation 21.30, A=122VFor an ideal gas, nNVPVB
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .