作者colorya2001 (遨游天空)
看板Physics
标题[题目] 反射波
时间Fri Jan 2 16:38:58 2009
[领域]波动 (题目相关领域)
[来源]普物 (课本习题、考古题、参考书...)
[题目]
A wave propagate on a string in the +x direction and is totally reflected
at x=d ,where the string is tied to a post .If the incident wave function
is expressed as y(x,t)=A sin(kx-wt);then the reflected function y(x,t) must
be expressed as
Anser:A sin(kx+wt-2kd)
[瓶颈] (写写自己的想法，方便大家为你解答)
入射波y1(x,t)=A sin(kx-wt)
因为是反射波 所以设反射波为y2(x,t)=A sin(kx+wt+Φ)
而题目中条件y1(d)=0
然後就不晓得从哪下手了? 希望有高手能提示一下...
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1F：推 linesa:在d全反射(无透射波),Asin(kd-wt)+Asin(kd+wt+Φ)=0,I+R=T 01/02 19:52
2F：→ linesa:sin(kd-wt)=-sin(kd+wt+Φ) = sin(-kd-wt-Φ) 01/02 19:53
3F：→ linesa:Φ=-2kd 01/02 19:54
4F：→ colorya2001:感恩...你说的很清楚，谢谢！ 01/03 11:22