GAIsweetGAI
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A Somewhat Urgent Question On Physics: Pulsation

Wed Mar 21, 2007 9:10 am

I'm doing the physics Concours Général in physics on Thursday, and in math on Monday. To prepare, I looked at previous years' sujet's (I can't find the translation right now), and some talk of a pulsation, omega, in relation to light, that I don't know anything about.
I asked my teacher today and he couldn't come up with a definite answer.
So do any of you know what pulsation is or represents, and what formulas are associated with it?

Thanks for any constructive answers.
"There is an art, or rather a knack to flying. The knack lies in learning how to throw yourself at the ground and miss."
 
iamcanadian
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RE: A Somewhat Urgent Question On Physics: Pulsation

Wed Mar 21, 2007 9:24 am

If I interpret correctly, "pulsation" is a French translation of frequency. Omega represents the angular frequency of a wave:

(just for reference, "w" is the same as "omega"; well, more or less anyway. The Greek letter "omega" is like a curvy w).

w = 2(pi) * f = 2(pi) / T

Where f is the frequency of the wave (cycles/second), and T is the period (time it takes to complete one cycle).

Other formulas you can find HERE

Hope this helps! Good luck!
Shut up and calculate.
 
GAIsweetGAI
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RE: A Somewhat Urgent Question On Physics: Pulsation

Wed Mar 21, 2007 9:55 am

Quoting Iamcanadian (Reply 2):

I'm nut sure I completely understand what w represents, but this already explains a lot. Thanks!  Smile
"There is an art, or rather a knack to flying. The knack lies in learning how to throw yourself at the ground and miss."
 
iamcanadian
Posts: 704
Joined: Wed May 30, 2001 6:53 am

RE: A Somewhat Urgent Question On Physics: Pulsation

Wed Mar 21, 2007 10:08 am

Quoting GAIsweetGAI (Reply 3):
I'm nut sure I completely understand what w represents

Okay, let's put it this way:

"Light" is a form of electromagnetic radiation (or EMR). There is an EMR scale on which different "kinds" of light lie on. For example, visible light exists at a wavelength of 400 to 700 nanometers. Using the formula:

v = f(lambda)

where v = speed of a wave, f = frequency, lambda= wavelength

We can substitute

w= 2(pi)f => f = w/2pi

=> v = {w(lambda)}/ 2pi

In this case, v= 3 x 10^8 m/s

I hope this helps. Just read up on light waves, and you should be fine.  smile 
Shut up and calculate.
 
KFLLCFII
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RE: A Somewhat Urgent Question On Physics: Pulsation

Wed Mar 21, 2007 10:36 am

what he said.
"About the only way to look at it, just a pity you are not POTUS KFLLCFII, seems as if we would all be better off."

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