本题目来源于试卷: SoundSoundSoundSound，类别为 IB物理学
[问答题]
Children sometimes play t3iji)nex/of 1yr4 64 vzy:or with j )finp-tzvi3e;mz2 s iox.igo(v-02 a homemade “telephone” by attaching a string to the bottoms of two paper cups. When the string is stretche n )ovv;i-.3gz-s m(2ixpo2 ti ij0fez d 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.
本题详细解析:
暂无
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