gc textbook chapter 12 Sound (id: d9eea3f08)

本题目来源于试卷: gc textbook chapter 12 Sound，类别为 通用国际物理

[问答题]
Children sometimes play with a homemb,84w c5t7ycqr5giq aade “telephone” by attaching a string to theycqb47i tqr,85c 5awgin,;e3q 6cmy),e cge,cudj 3a bottoms of two paper n 63,3cqe)i;,dce ,ajgcy meucups. When the string is stretched and a child speaks into one cup, the sound can be heard at the other cup (Fig. 12–29). Explain clearly how the sound wave travels from one cup to the other.

参考答案:
The child speaking into a cup creates sound waves which cause the bottom of the cup to vibrate.  Since the string is tightly attached to the bottom of the cup, the vibrations of the cup are transmitted to longitudinal waves in the string.  These longitudinal waves travel down the string, and cause the bottom of the receiver cup to vibrate.  This relatively large vibrating surface moves the adjacent air, and generates sound waves from the bottom of the cup, traveling up into the cup. These waves are incident on the receiver’s ear, and they hear the sound from the speaker.


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