2004年江苏省高考物理试卷第 6 题是一个考察能力的好题,该题要求考生根据给定的物理图景,推导出多普勒效应的定量表达式.原题如下:如图 1 所示,声源 S和观察者A 都沿x 轴正方向运动,相对地面的速率分别为 vS 和vA,空气中声音传播的速度为 vP,设 vSvP,vAvP,空气相对地面 In 2004, the sixth exam of Physical Examination Paper of Entrance Examination of Jiangsu Province was a good question for examining ability, which asked candidates to deduce the quantitative expression of Doppler effect according to the given physical picture. The original questions are as follows: As shown in Figure 1, Sound source S and observer A are positive along the x-axis movement, relative to the ground rate vS and vA, respectively, the speed of sound in the air vP, vSvP, vAvP, air relative to the ground