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Question:

How can I keep the rubber tube for stethoscope?

How can I keep the rubber tube for stethoscope?

Answer:

I don't think this question should be considered purely from the point of view of sound transmission.
First of all, why would the stethoscope sound by the hollow box head, the heart beat (vibration) into the vibration of the hollow box leaves, (also caused by internal air vibration), thus forming the sound of the heart.

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