Stethoscope Physics
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Stethoscope Physics
Physics question?
Physics question?
iF u place a stethoscope on an unmagnetized iron nail and then slowly move a strong magnet toward the nail, you can hear a faint crackling sound use the concept of domains to explain the sound ?
A good question! The magnetic domains will realign themselves towards the magnetic lines and in that process, a small amount of acoustic emission takes place.
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Stethoscope $19.99 Stethoscope - Art Print |
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Disposable Stethoscope(Pack of 1) $6.49 Designed for single patient use, our high visibility yellow stethoscope is perfect for use in infectious areas.Our Disposable Stethoscope Provides Excellent Sound and Helps Prevent Cross-ContaminationDisposable Stethoscope - Disposable Stethoscope |
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WET LAB "VET DREAMZ"
What concepts of Physics make the stethoscope work?
What principle allows the stethoscope to amplify the sound? What happens to the the sound waves inside the stethoscope?
I suppose that it is the conservation of energy, and Bernoulli's principle - which is really a part of the conservation of energy. You place a large flexible 'plate', or diaphragm, over the persons chest, and it will move slightly according to the vibrations sent from the beating heart.
When the diaphragm moves, it moves the enclosed air behind it. It transfers energy to the air that is in contact with the inner surface of the diaphragm. As the air moves away from the diaphragm the enclosure becomes narrower and narrower, but the energy of the waves stays the same, so instead of having the distance parallel to the diaphragm to move in, it moves more and more in the direction perpendicular to the diaphragm; that is, it moves back and forth in the tube with more force. And as the space continues to narrow, it goes back and forth with more and more amplitude.
Bernoulli's Principle states that when a moving liquid or gas is restricted in a pipe, the gas or liquid in the narrow part of the pipe will move the fastest. And since the sound pressure waves are moving back and forth, they move back and forth faster. Since they move faster for the same period of time, they must move farther.
This sort of focalization of the energy of the diaphragm into a high energy narrow tube is then used to move another smaller diaphragm near the listener's ear. Since this diaphragm is much smaller, it will vibrate with more amplitude since it is being driven by the energy from the larger diaphragm, making it sound as if the sound wave had been amplified.
