问题 填空题

如图所示为一列横波在某一时刻的波形图,已知波的频率为2Hz,则这列波的波速为______m/s,若在x=6cm处的质点此时正向y轴负方向运动,该波的传播方向为______.

答案

由图知,波长λ=8cm=0.08m

则波速为v=λf=0.16m/s

若在x=6cm处的质点此时正向y轴负方向运动,波形向左平移,则该波向左传播.

故答案为:0.16,向左

综合

读图回答问题:

1、写出图中数码代表的地理事物: 

  ①:               海峡     海域:②                     ③                    

2、写出图中字母代表的地理事物:

(1)港口:A                 B                 C               

(2)盐场:D                   铁矿地:E                

3、海南作为经济对外开放区的有利条件有哪些?(从地理位置和资源条件分析)

                                                                                                                                                               

                                                                                                                                                               

                                                                                                                                                               

单项选择题 A3/A4型题