人教版普通高中物理课程标准实验教科书物理1(必修)第47页问题与练习第4题:频闪摄影是研究变速运动常用的实验手段.在暗室中,照相机的快门处于常开状态,频闪仪每隔一定时间发出一次短暂的强烈闪光,照亮运动的物体,于是胶片上记录了物体在几个闪光时刻的位置.图1为小 PEP Ordinary High School Physics Curriculum Standards Experiment Textbook Physics 1 (required) Page 47 Questions and Practices Question 4: Strobe Photography is a commonly used experimental method to study variable speed motion. In a dark room, the shutter of the camera is in the normally open state. The flasher emits a brief intense flash at regular intervals to illuminate the moving object. The film then records the position of the object at several flash moments. Figure 1 is small