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 Post subject: Confusion: Longitudinal and transverse.Posted: Fri, 6 Jun 2003 09:59:38 UTC
 S.O.S. Oldtimer

Joined: Fri, 23 May 2003 11:09:48 UTC
Posts: 206
Im slightly confused.. What waves do sound actually travel in?
In the first chapter of my physics book it mentions both.

Tranverse waves, where particles of a medium vibrate perpendicular to the wave propagation,

Longitudinal Waves, where particles vibrate parallel to the direction of wave propagation..

However it doesnt say why we need to both..

If a particle 'P' were suspended in air, and a speaker makes to the right of it. Would 'P' be moving left/right (longitudinal) or up/down (transverse)

thanks!!

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 Post subject: Posted: Fri, 6 Jun 2003 10:13:49 UTC
 Senior Member

Joined: Mon, 19 May 2003 07:20:59 UTC
Posts: 123
Location: Australia
Sound waves are LONGITUDINAL waves.

P would move left/right.

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 Post subject: Posted: Fri, 6 Jun 2003 13:38:12 UTC
 S.O.S. Oldtimer

Joined: Fri, 23 May 2003 11:09:48 UTC
Posts: 206
I see. Thank you.
Any idea why the textbook would introduce both types of waves in the 'Sound' Chapters?
thanks again.

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 Post subject: longitudinal and transversePosted: Mon, 9 Jun 2003 14:39:52 UTC
 Member

Joined: Wed, 28 May 2003 11:27:09 UTC
Posts: 30
Perhaps the book introduced it so to give a better idea about how loud the resulting noise was. Of course sound travels in longitudonal waves with the molecules of the medium vibrating and transferring the noise, but the idea of a transverse wave is more easier to think of when comparing the intensity of two different sounds, ie which is louder.

Question.
If a tree falls down in a forest and there is no-one there to see it or hear it, how do you know that it has actually fallen down?

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 Post subject: Posted: Tue, 10 Jun 2003 13:40:28 UTC
 Member

Joined: Wed, 28 May 2003 11:27:09 UTC
Posts: 30
OOPS
Last question slightly wrong,

It should be Does the tree make a sound?

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