# Tag Info

### How exactly does a seashell make the humming sound?

While inside your house, place a shell or a cup or a drinking glass or even a cupped hand over your ear and you will observe the same phenomena. Assuming there is no significant wind inside your house ...
• 6,112

### How exactly does a seashell make the humming sound?

Your third option is the closest to the case. The seashell forms a cavity resonator, which will have some characteristic frequency response determined by things like the shape of the shell etc. ...
• 3,819

### How exactly does a seashell make the humming sound?

The shell with a small opening forms a Helmholtz resonator that is excited by noise from outside. Image from Formulas of Acoustics, F.P. Mechel pp72. The Wikipedia article has relevant equations for a ...

### Doppler shift from a moving reflector and source if only the relative velocity is known?

can we determine the relative velocity with doppler effect? Yes we can. This is similar to the principle that that police speed radar works on, except that the police radar uses electromagnetic waves....
• 6,112
Accepted

### "Friction at a contact point", rubber-band experiment

Yes, there will be some heat produced as a result of friction between the rubber band and the board, and also some heat produced as a result of internal friction within the rubber band itself, as it ...
• 56.4k
1 vote

### What is the difference between loudness, amplitude and volume?

The terms are related, but they are certainly not the same. The peak amplitude of a wave is its maximum displacement away from its equilibrium position. This term can be applied to any type of wave, ...
• 56.4k
1 vote
Accepted

### Why is there a relationship between thickness of an acoustic panel and the sound frequencies it absorbs?

There are two things going on here. There are the resonant modes of the absorber, and there is the ability of the material to absorb energy. Just like a string of a certain tension, linear mass ...
1 vote

### How exactly does a seashell make the humming sound?

The question to the answer is: The seashell does not make noise. The answer to the question: What is the source of what you hear if you close your one ear with a cup and close the other ear competely ...
• 11
1 vote

### How exactly does a seashell make the humming sound?

Neither of the three explanations are true. Actually, the seashell amplifies and reflects the sound of your blood flowing through the blood vessels in your ear! That is what you hear as humming.

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