(3)ek=3KT/2=(3/2)×1.38×1023×273 21 57×10=2KT/2=38×102J (4)…P=nT 1=P/(km) Ek=1·s=Pek(kT) =10×10-2×1.013×103×5.6×10-21/(1.38×1023×273) =1.5×103JJ (5E=Mi B=0.3×(5/2)×831×273 1.7×103J(3) k = 3KT / 2 (3/2) 1.38 10 273 23 =    - J 10 21 5.7 - =  1.7 10 J 3 =  (4)P = nkT n = P /(kT), Ek n  k =  P /(kT) =  k 1.0 10 1.013 10 5.6 10 /(1.38 10 273) 2 5 21 23 =        - - - 1.5 10 J 3 =  RT M i E 2 (5)  = = 0.3(5/ 2)8.31273 KT J k 21 2 / 2 3.8 10-  = =  转