4,处在热力学温度为T的平衡态的1 mol氦气(视为单原子分子理想气体)的内能为dfrac (3)(2)kpi B)dfrac (5)(2)kT(C) dfrac (3)(2)RT (D)5/2RT(k为玻尔兹曼常数，R为普适气体常数)

3,处在热力学温度为了的平衡态的单原子分子理想气体,分子的平均平动动能为( ) (k为玻尔兹曼常数,R为普适气体常数)(A) dfrac (5)(2)kJ (B

对于处在平衡态下温度为T的理想气体,dfrac (3)(2)kT的物理意义是________________________________________.(

dfrac (3)(2)RC dfrac (7)(2)R D. dfrac (3)(2)RT对于双原子气体的摩尔定压热容的表达式为()

试说明下列各量的物理意义。（1）(1)/(2)kT（2）(3)/(2)kT（3）(i)/(2)kT（4）(M)/(M_(mol))(i)/(2)RT（5）(i)

单原子分子理想气体的定容摩尔热容: ( )A.dfrac (1)(2)RB.dfrac (1)(2)RC.dfrac (1)(2)R

dfrac (1)(5)(X)_(1)+dfrac (2)(5)(X)_(2)+dfrac (2)(5)(X)_(3)-|||-D .dfrac (1)(7)(

B. dfrac {1)(2) . C. dfrac (2)(3) . D. dfrac (3)(4)

(B) =-dfrac (x)(2)+dfrac (3)(2)-|||-(C) =dfrac (x)(2)+dfrac (3)(2) (D) =-dfrac (

已知_(1)=((dfrac {1)(3),-dfrac (2)(3),-dfrac (2)(3))}^T, _(2)=((-dfrac {2)(3),dfra

(B) =2, =dfrac (1)(3).-|||-(C) =1, =dfrac (1)(2). (D) =1, =-dfrac (1)(3),求指导本题解题