- #1
jaumzaum
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Hi, I'm finished studying ondulatory and I have maany questions I still don't understand. I would be thankful if someone could help me in that, Because I'm pretty lost. I'm going to ask them in letters (A, B, C...), each one is a different doubt.A man has photographed (with a fixed camera in a fixed place) the movemment of a group of particles that describes an ondulatory movemment. He has taken 6 pictures at all, with an interval of 0.1s from one to another.
[PLAIN]http://img88.imageshack.us/img88/2383/unled1hb.jpg
[PLAIN]http://img40.imageshack.us/img40/5232/36055600.jpg [PLAIN]http://img828.imageshack.us/img828/3232/12390797.jpg
[PLAIN]http://img546.imageshack.us/img546/3313/sdfsdgdfhfg.jpg
[PLAIN]http://img855.imageshack.us/img855/1650/4vvv.jpg
[PLAIN]http://img3.imageshack.us/img3/7914/54590617.jpg
Suppose the particles were photons
A) We can see that the particles has a pure ondulatory movement (POM) + a horizontal movement. What do I mean by a pure ondulatory movement?
This is a pure ondulatory movement
[PLAIN]http://img88.imageshack.us/img88/2383/unled1hb.jpg
[PLAIN]http://img580.imageshack.us/img580/9205/94982373.jpg
[PLAIN]http://img51.imageshack.us/img51/6260/97579754.jpg
[PLAIN]http://img30.imageshack.us/img30/2192/45941021.jpg
[PLAIN]http://img855.imageshack.us/img855/7759/21054272.jpg
[PLAIN]http://img830.imageshack.us/img830/3765/90509177.jpg
Note that in a this movement given a fixed position, like x = 3, we have a constant y.
In a POM the equation is like that y = F(x) = A.cos(z.x)
Where A and z are constants.
In a variable ondulatory movement (VOM) we have y = F(X, t) = A.cos(z.x - w.t)
Where A, z, and w are constants, x and t variables.
First question, the sound wave motion is a VOM or a POM?
* Note that I really don't know the names of this type of movement in english, so I've tried to traduce from portuguese. I think that acronyms don't even exist. But let's assume it's like that.
B) We can see that we have 2 lambda (wave lenght) for the VOM. The first is if we compare that the reference is the first particle in relation to the last one.
[PLAIN]http://img41.imageshack.us/img41/4719/adghnsdfbdfbsdf.jpg
The second is if you compare the movement of one particle only (by the whole movement). In the case was the first.
[PLAIN]http://img823.imageshack.us/img823/8355/adfhsdfhf.jpg The frequency does not change, so what's the lambda that we calculate from
[itex] v = \lambda.f [/itex] ?
I mean, if sound is VOM, the 340m/s represents lambda 1 or lambda 2?
And here it's another question. The VOM can be decomposed in pure ondulatory movement + horizontal extra moviment. Let's say the velocity of the e pure ondulatory movement in Vp and the velocity of the extra horizontal is Vh. Vpx is the Vp in x axe and Vpy in the y axe.So if ann exercise gives you the velocity of a wave, is it the Vpx + Vh, VH only or Vpx only?
C) What types of waves are VOM/ POM?
I have more questions, but I will have to understand all theese before I post the others.[]'s
João
[PLAIN]http://img88.imageshack.us/img88/2383/unled1hb.jpg
[PLAIN]http://img40.imageshack.us/img40/5232/36055600.jpg [PLAIN]http://img828.imageshack.us/img828/3232/12390797.jpg
[PLAIN]http://img546.imageshack.us/img546/3313/sdfsdgdfhfg.jpg
[PLAIN]http://img855.imageshack.us/img855/1650/4vvv.jpg
[PLAIN]http://img3.imageshack.us/img3/7914/54590617.jpg
Suppose the particles were photons
A) We can see that the particles has a pure ondulatory movement (POM) + a horizontal movement. What do I mean by a pure ondulatory movement?
This is a pure ondulatory movement
[PLAIN]http://img88.imageshack.us/img88/2383/unled1hb.jpg
[PLAIN]http://img580.imageshack.us/img580/9205/94982373.jpg
[PLAIN]http://img51.imageshack.us/img51/6260/97579754.jpg
[PLAIN]http://img30.imageshack.us/img30/2192/45941021.jpg
[PLAIN]http://img855.imageshack.us/img855/7759/21054272.jpg
[PLAIN]http://img830.imageshack.us/img830/3765/90509177.jpg
Note that in a this movement given a fixed position, like x = 3, we have a constant y.
In a POM the equation is like that y = F(x) = A.cos(z.x)
Where A and z are constants.
In a variable ondulatory movement (VOM) we have y = F(X, t) = A.cos(z.x - w.t)
Where A, z, and w are constants, x and t variables.
First question, the sound wave motion is a VOM or a POM?
* Note that I really don't know the names of this type of movement in english, so I've tried to traduce from portuguese. I think that acronyms don't even exist. But let's assume it's like that.
B) We can see that we have 2 lambda (wave lenght) for the VOM. The first is if we compare that the reference is the first particle in relation to the last one.
[PLAIN]http://img41.imageshack.us/img41/4719/adghnsdfbdfbsdf.jpg
The second is if you compare the movement of one particle only (by the whole movement). In the case was the first.
[PLAIN]http://img823.imageshack.us/img823/8355/adfhsdfhf.jpg The frequency does not change, so what's the lambda that we calculate from
[itex] v = \lambda.f [/itex] ?
I mean, if sound is VOM, the 340m/s represents lambda 1 or lambda 2?
And here it's another question. The VOM can be decomposed in pure ondulatory movement + horizontal extra moviment. Let's say the velocity of the e pure ondulatory movement in Vp and the velocity of the extra horizontal is Vh. Vpx is the Vp in x axe and Vpy in the y axe.So if ann exercise gives you the velocity of a wave, is it the Vpx + Vh, VH only or Vpx only?
C) What types of waves are VOM/ POM?
I have more questions, but I will have to understand all theese before I post the others.[]'s
João
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