问题 不定项选择

一个波源在绳的左端发出半个波①,频率为f1,振幅为A1;同时另一个波源在绳的右端发出半个波②,频率为f2,振幅为A2,P为两波源的中点,由图可知,下述说法正确的是

A.两列波同时到达两波源的中点P

B.两列波相遇时,P点波峰值可达A1+A2

C.两列波相遇后,各自仍保持原来的波形独立传播

D.两列波相遇时,绳上的波峰可达A1+A2的点只有一点,此点在P点的左侧

答案

ACD

简答题

下面是校园生活的几个情景,请你任选两个运用所学知识予以答复。

(1)老师安排小龙等几位同学星期天到学校进行体育训练,恰巧小龙的父母计划带他去郊游,小龙一时兴奋,忘记了老师的安排,第二天到校后,小龙该                                                                            

                                                                                                                     (写出正确做法,说明原因)

(2)开学初,某校门口张贴“向灾区人民献爱心”的倡议书,倡议同学们向受灾地区的人们捐款捐物。你会                                                                                                                                                     

                                                                                                                                                              (写出正确做法,说明原因)

(3)在班里组织的一次模拟法庭活动中,小海准备当一回法官,而老师却安排小海演被告的角色,小海正在犹豫,你认为他应该                                                                                                                                                          

                                                                                                                                                              

                                                                                                                                                                (写出正确做法,说明原因)

判断题