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

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

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

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
Posts: 3185
Joined: Sat Sep 11, 2004 7:08 am

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."

Who is online

Users browsing this forum: Google [Bot], Yahoo [Bot] and 25 guests

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos