一石激起千层浪出处?春江花月夜里第几句

“一石激起千层浪”,说明了水面的振动以___横波___形式传播,类似地,声在空气中是以___纵波___的形式向远处传播.

一石激起千层浪-----两指弹出万般音

一石激起千层浪---ripple effect
A gradually spreading effect or influence:
The ripple effect is an education-related term associated with the studies of Jacob Kounin.It involves the effects that a reprimand in a group has on members of the group who are not the intended targets of the reprimand (or desist,as Kounin coins it).The ripple effect can also apply if students are not reprimanded to correct a behavior.For example,if one student is talking when he or she is not supposed to be talking,and is not reprimanded,the behavior will spread like a ripple through water,as the rest of the class becomes increasingly more likely to talk at inappropriate times.However,this example does not necessarily apply in all situations,as many variables are introduced through human interaction as in a classroom setting.

解题思路：由“要使原本平静的水面保持平静，”可知y₁+y₂+y₃=0，从而求得y₃．

因为y₁+y₂+y₃=sint+sin（t+[2π/3]）+y₃=0
即[1/2]sint+

3
2cost+y₃=0，
所以y₃=sin（t+[4π/3]）时符合题意．
本题也可为y₃=sin（t-[2π/3]）（答案不惟一）．
故答案为：y₃=sin（t+[4π/3]）

点评：
本题考点： 在实际问题中建立三角函数模型．

考点点评： 本题主要考查应用题的基本做法，要注意关键字，词与关键句建立数学模型．

“一石激起千层浪”是说扔一块石头到水中掀起千层浪花.比喻一句话或某一细小行动,会引起强烈的反响.如果要用这个词来表示打破平静的话,还注意它的结果是能引起强烈的反响.

一石激起千层浪 　　【注音】yī shí jī qǐ qiān céng làng 　　【释义】扔一块石头到水中掀起千层浪花.比喻一句话或某一细小行动,会引起强烈的反响.　　【押韵词】蜂拥而上、雨霾风障、能人巧匠、横行直撞、...

A tossed stone raises a thousand ripples

声波由于声带振动引起空气振动,空气形成疏密相间的形状,进行传播,引起耳朵的振动

“牵一发而动全身”

C

A．管－菅；B．截－节；志D．祥－详

声音以波的形式向外传播,同时因为声具有能量,也就是波具有能量,使树叶晃动.

圆的半径；圆的面积（或周长）；S=πr ² ；24π