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# The perceived change to the tone of, say, a siren on an emergency vehicle as it passes by is the Doppler effect. Is there a specific name for the rising tone of the sound of a liquid filling a glass?

Question #59952. Asked by Linus_337. (Oct 13 05 12:43 PM)

satguru

I don't know if it has a name, but unlike the Doppler effect it's not an illusion, as the frequency increases in the air remaining in the glass as it is reduced, and is just acting like a bell. If there's no name I'll nominate 'the bell effect'!

 Oct 13 05, 4:40 PM
peasypod

The frequency changes due to the standing waves produced. As the air column length decreases, the wavelength of standing waves that can be produced also increases and hence the frequency of the sound increases as the bottle is filled.

 Oct 14 05, 5:02 AM
Linus_337

Brilliant. Thanks for that.

 Oct 14 05, 12:04 PM

This effect is sometimes referred to as "scalar resonance" or "rising scale resonance"

 Oct 17 05, 7:19 AM

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