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如图所示，一列简谐横波沿x轴传播，实线为t1=0时刻的波形图，虚线为t2=0.25s时刻的波形图，则该波的传播速度大小为______；若已知该波的波速大小为22m/s，则该波沿x轴______（选填“正”或“负”）方向传播．

答案

若波向右传播，时间t=0.25s与周期的关系为t=(n+

1
4
)T，波速为v=
λ
T
=
2
0.25
n+
1
4
m/s（n=0，1，2，…）

若波向左传播，时间t=0.25s与周期的关系为t=(n+

3
4
)T，波速为v=
λ
T
=
2
0.25
n+
3
4
m/s（n=0，1，2，…）

 综上可得，v=（2+4n）m/s（n=0，1，2，…）

若已知当波向x轴负方向传播时，n=2时，该波的波速大小为22m/s，因此波向x轴负方向传播．

故答案为：（2+4n）m/s（n=0，1，2，…）；负．

材料分析题

材料一：据新华网报道，“你觉得作为子女，应怎样对父母尽孝？”暑假期间，天津四中对多所学校100名八年级学生进行了一次有关“孝心”的校园调查，在调查中，一些学生坦言，他们并不觉得记住长辈生日、帮助父母做饭就是孝心的体现；相反，他们觉得这些都是父母不在意的小事。针对“作为子女，应怎样对父母尽孝？”这样的问题，有90%的学生回答，父母对他们的希望只是让他们学习好，考100分，上大学，认为“只要好好学习，考高分就是孝敬父母了”。

材料二：读漫画《孝敬观》

阅读上述材料和漫画，结合所学知识，完成下列问题。

（1）你认为漫画中学生的行为是否正确，请作简要分析。

________________________________________________________________________________________________________________________________________________________________________________________

（2）目前，有些父母对子女孝敬父母产生了这样错误的认识：“子女好好学习，考出好成绩就是孝敬父母。”我们青少年学生应怎样对待父母的错误认识？

________________________________________________________________________________________________________________________________________________________________________________________

（3）相信你是一位孝敬父母的中学生，请就青少年学生应如何孝敬父母提出几条合理化建议。

________________________________________________________________________________________________________________________________________________________________________________________
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