陳碧利

波長 波速 波谷 波峰

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因為此問題有附圖形,我無法貼上圖片,故以下為安全的問題網址

https://www.i-qahand.com/exam/question/201603300000007580

答案:C

請幫我解釋ABCD選項怎麼解出的?

                    以及P出現二次波峰:是指P出現二次波峰的位置是(X,Y)=(6,2)還(10,2)呢?
                            Q第一次到波峰的位置在(X,Y)=(10,2)還(14,2)呢?
 
因為我不太懂題目的意思,所以解不出來答案
          
   謝謝

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補上圖的題目,怕有人覺得網址的有毒的(更正答案是3)

Q:一正弦波沿x軸方向傳播,在t  0時刻的波形如右圖所示,已知此波在P點出現二次波峰的時間間隔為 0.8 秒。

則下列敘述何者正確?

1.此波波長為5 公尺  2.此波波速為10 公尺/秒

 3. 質點Q 再經過1.4 秒,才能第一次到達波峰處   4.質點Q 到達波峰時,P 質點恰好到達波谷處

 

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