机械波典型问题分析与解答

通过对近几年高考中机械波典型题的分析,说明深刻理解机械波的形成过程、抓住振动和波之间的联系是分析解决机械波问题的关键。     

“波的形成和传播”的教学设计

一、教学目标1.知识与技能:掌握机械波的形成过程及其形成条件;知道机械波的种类——横波和纵波;明确机械波的传播特征.2.过程与方法:通过波的模型的建立,提高学生的空间想象能力;通过对波的模型进行分析判断,提高分析     

关于机械波的几个问题

机械波是机械振动在弹性介质(如水、空气等)中的传播过程。常见的机械波有声波、超声波、绳波以及液面(水)波等等。在力学的教学过程中,学生对机械波的概念,有如下几方面的问题容易混淆:(1)纵波的波形图线与横波的波形图线的区别;(2)波速、波张与频率之间的关系;(3)液面波是否是横波。本文将要讨论这三个问题。     

解析机械波的多解性问题

一,机械波多解的原因 在机械波传播过程中,一个周期内的不同时刻波的形状是不同的,但在相隔时间为周期整数倍的不同时刻波的形状则是相同的,也就是说机械波在传播过程中具有周期性,机械波的这种周期性必然导致波的传播距离、时间、速度及质点振动所通过的路程等物理量具有多值性．     

《波的形成和传播》教学设计放飞心灵抒写真情

一、教学目标知识目标： 1．理解什么是机械波，理解波的形成和传播特点。 2．知道横波和纵波，波峰和波谷，密部和疏部。 3．知道机械波，理解机械波传播振动形式，能量、信息。     

机械波的七类难点问题剖析

机械波是力学部分的重要内容,综观“机械波”一章,结合考试常考察的知识点以及学生难以掌握的地方,机械波问题中有下面的七类难点:波长的判断,波的多解问题,知波的传播方向判断某质点振动方向,画Δt后的波形图,波的干涉,振动和波动的综合,多普勒效应问题·一、“波长”的确定①     

机械波多解问题的分类例析

对于机械波沿一条直线传播的情形,波传播方向的双向性和波的周期性以及质点振动方向未确定时,常会产生机械波问题的多解.因此解答上述多解问题时需要全面进行分析,以免漏解.     

“机械波的图象”高考题赏析

“机械波的图象”是机械波的难点,是整个力学的重点,是高考的热点．机械振动在介质中的传播,形成机械波．产生机械波的条件：同时存在振源和介质．机械波向外传播是振动形式的传播,介质中各质点不随波发生迁移．波是传递能量的一种方式．下面结合高考题,对此类题作一归纳、分析,供参考．     

机械波单元检测

一、选择题 1．关于振动和波的关系。下列说法正确的是A．有机械波必有机械振动B．有机械振动必有机械波C．离波源远的质点振动得慢D．波源停止振动时，介质中的波立即停住     

机械波图像问题的分类方法探索

<正>机械波的图像问题分类方式繁多,学生学到的题型方法也就多而乱.无论是题型还是方法,都缺乏系统性,难以记忆、掌握和应用.本文拟就机械波的图像问题的归类分析作简要的探讨,力求分类科学、全面、简明扼要,并结合最近几年高考中出现的考题说明对应类型问题的解题策略.不少老师把机械波的图像问题分为:1波的基本概念类问题;2波传播过程中多解问题;3波的图像判断质点振动问题;4波的图像和振动图像结合题等.类似分类方法还有很     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

团图为数的图中的闭团贯数

Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.