Talk:Standing wave

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[edit] Standing Wave Math Expression

It seems being a paradox. For

\mathcal {\mid}\Psi(x,t){\mid}^2=A^2sin^{2}(kx)*cos^{2}({\omega}t)=0 {\neq}1

which means that it does not equal to 1. Thus caused not coresponse Normalization. Known a standing wave is expressed as

\mathcal, \Psi(x,t)=Asin(kx)*cos({\omega}t),.

Can anyone talk about your thoughts? Thanks.

By their math expression we can clearly find angular frequency of \mathcal V_p , \mathcal \omega which keeps constant when a wave vibrates up and down localized. That may because of energy transports into a wave is conservative,just like a particel moves up and down in a Y axis,localizedly(which keeps energy conservative).
But for another one,it travels in an X axis,that hints its phase-angular is the function of time. By time changes,then \mathcal \omega naturely changes either.

I'm a little not sure above. Could anyone discuss with me? --HydrogenSu 19:03, 1 February 2006 (UTC)

[edit] Acoustic Standing Waves?

As someone familiar with Sound Theory, Im really disappointed with this article. There is hardly any reference to the effects of standing waves with regard to Acoustics & Sound waves. Ask any producer, sound engineer, audiophile, anyone who works with sound in spaces and theyll probably say standing waves are their biggest problems. It would be great if theres more info on how standing waves occur, how they disrupt the listening experience, methods to negate them and other subjects that relate to these waves acoustically. I would write something up myself, but i dont know enough about them to do so (hence,looking it up) !!! Shado.za 11:47, 2 June 2006 (UTC)

[edit] what is this?

is there anybody else can say properly about this subject. i really need to know about standing wave.....

basically, if a string is set to oscillate (vibrate) from one end, and it is fixed at the other end, a wave travels along the string, until it gets to the end, where it is reflected back towards the other end. This is called superpositioning. By carefully adjusting the frequency of the string, you can form stationary waves, which is when the reflections occur so that a peak meets a trough, so they cancel (destructive interference). This forms a "node" point halfway along the string. Either side of the node point, a peak meets a peak, or a trough meets a trough, so they add together to create constructive interference. If the frequency of the open string is 25Hz, then there will be 2 standing waves when you double the frequency to 50Hz. 3 at 75Hz, etc etc. You can set a strobe light to flash at a similar frequency to "slow down" the motion of the waves. Hope this helps, Chris.

[edit] Definition

When two progressive waves having same amplitude , same period , same wave length and travelling in the same medium along the same line but in opposite direction superimpose, then the resultant of such two waves is known as Stationary wave or Standing wave.

This was added (with more typos in) to the main article. While having two similar definitions that don't really compliment each other can only create confusion, I don't really want to dismiss this explanation totally. I think this article is in need of a re-write, incorporating a lot more about the physical phenomena of standing waves and not just focusing on electrical engineering. I don't have time to do this myself but I think this and the explanation from the post above need to be worked into the article. OrangeDog 15:32, 6 November 2006 (UTC)

Dude im just a uni phisist but that definition is complete and utter bolloks. The resultant wave of two opposing waves doesnt have to be standing simply because they constructivly superpose.

Ok so maybe I didn't read it that closely but the article still needs work OrangeDog 11:28, 23 November 2006 (UTC)

On the subject of definition: I think you have mixed up two different types of wave: standing and stationary. A standing wave is, as your animation shows, oscillating in place. This would not be much good to a glider pilot. A stationary wave, on the other hand, has no time variation but does have a spatial wave structure. This is good for the glider pilot because he can sit in a fixed position where the air is rising. Would you object if I tried to split your article into two -- one on standing waves and one on stationary waves? mnjuckes 2 April, 2007

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