GAIsweetGAI
Topic Author
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Joined: Wed Jul 19, 2006 5:19 am

### A Somewhat Urgent Question On Physics: Pulsation

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?

"There is an art, or rather a knack to flying. The knack lies in learning how to throw yourself at the ground and miss."

Posts: 704
Joined: Wed May 30, 2001 6:53 am

### RE: A Somewhat Urgent Question On Physics: Pulsation

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
Topic Author
Posts: 887
Joined: Wed Jul 19, 2006 5:19 am

### RE: A Somewhat Urgent Question On Physics: Pulsation

I'm nut sure I completely understand what w represents, but this already explains a lot. Thanks!
"There is an art, or rather a knack to flying. The knack lies in learning how to throw yourself at the ground and miss."

Posts: 704
Joined: Wed May 30, 2001 6:53 am

### RE: A Somewhat Urgent Question On Physics: Pulsation

 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.
Shut up and calculate.

KFLLCFII
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Joined: Sat Sep 11, 2004 7:08 am

### RE: A Somewhat Urgent Question On Physics: Pulsation

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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