弦驻波的能量

The Energy of Standing─Wave in a String

首先得出了弦驻波的能量公式和能流公式，从而说明驻波的能量在相邻波节与波腹之间来回传输，其能量振动的周期为驻波振动周期的一半。进一步用作图法说明，当振动达到最大时能量储存在波节附近；当振动经过平衡位置时，能量储存在波腹附近。最后指出实际的弦驻波实验是有能量传递的。

Firstly this paper gains the formulas of the energy and energy stream ofstanding-wave in a string,and explains when the energy transfer of standing─wave goesand comes between node and antinode,that the cycle of the eiiergy vibration is half as muchas the cycle of standing-wave vibration in a string.Secondly,with the aid of the figures itwas explained that when the amptilude of the vibration was the mi11imum,the energy wasgot together near antinode.Lastly,it was proposed that the experiment of real standing-wave in a string had energy transfer.