i had always belived that sound wave was a longitudinal wave till i come across something saying that its a transverse wave in solid.can anyone explain is it so??
In a fluid like air, sound waves are only longitudinal, since fluids don't support shear forces. Solids support both longitudinal and transverse sound waves, and they typically travel at different speeds.i had always belived that sound wave was a longitudinal wave till i come across something saying that its a transverse wave in solid.can anyone explain is it so??
if solid support both does that mean that sound is a transverse wave in solids??In a fluid like air, sound waves are only longitudinal, since fluids don't support shear forces. Solids support both longitudinal and transverse sound waves, and they typically travel at different speeds.
It is almost true by definition, for a common sense definition of "sound". If the surface of the solid doesn't move transversely to the surface, it doesn't transmit any pressure vibrations to the air. (OK, let's ignore the tiny amount of energy that would get into the boundary layer and be dissipated by the air viscosity before it got anywhere else.)Am desperately trying to picture that
any further info please ?
you are telling me that it is a longitudinal wave in the solid but transverse wave at the surface.Inside a solid, sounds is longitudinal. However, at the surface of a solid, sound is transverse. The surface is a like a membrane, its oscillations can only be transverse.
If you attach a solid body directly to an acoustic sensor, a transverse wave will excite it just the same as a longitudinal wave would.There are different modes of vibration in solids but only those that can set up longitudinal waves in the surroundings are related to sound.
apparently sound can be longitudinal and transverse wave but air and fluid cannot support transverse wave and sound can be transverse wave in solidI think the answer to the OPs question is no. Sound waves are longitudinal and not transverse. By definition sound waves are related to those types of waves that can be sensed by the ear and the ear drum reacts to longitudinal vibrations.
A solid may be able to vibrate in different ways but only the longitudinal components of those vibrations can be transferred to any surrounding air as sound waves. It reminds me of the longitudinal and transverse vibrations that can be set up on a stretched string. Both set up longitudinal vibrations (sound waves) in the surrounding air.
Vibrations which travel through the air or another medium and are sensed by the ear.What's your definition of "sound"? And why is your definition relevant for me or anyone else?
So ultrasound is not sound then?Vibrations which travel through the air or another medium and are sensed by the ear.
I am pretty sure that if a solid bar is made to touch the eardrums, a surface acoustic wave on it will be registered.The relevant part of this discussion is that the vibrations "are sensed by the ear" and the ear responds to longitudinal vibrations.
I think it's well understood by all here that ultrasound is sound and we could go for more detailed definitions such as defining "sounds which are audible to humans" or to bats or to any other animal species. But I don't want to get involved in semantics but want to see OPs question answered at a suitable level.So ultrasound is not sound then?