Anyone good with physics? Physics Problem

[xvdarkyvx21]

Can someone help me out with my physics homework? I need to answer this question and it deals with interference. Thanks.

"The coherence lenght of a wavetrain is the distance over which the phase constant stays the same. An atom of a light source emits coherent light for 10 ns. Calculate the coherence lenght of this wavetrain. c = 3*10^8 m/s"

 

[Random Variable]

I know nothing about physics.

 

[Evadman]

I can't read that. can you unhighlight it?

 

[Rastus]

The plane takes off.

 

[lyssword]

Originally posted by: Rastus
The plane takes off.

QFT

 

[ones3k]

sure just plug it into this equation coherence = c^2 + e^(sqrt(ln(pi))) + c*sigma(i = 0 to infinity)(2/i^(1.002)) + integral(from 0 to infinity) (12424/x^2) + abcdefghijk/sqrt(z) + dslfksldkgsd



easy

 

[2Xtreme21]

While I do not know anything about that particular topic, here are some links that you may find helpful:

http://en.wikipedia.org/wiki/Coherence_length
http://www.fou.uib.no/fd/1996/h/404001/kap04.htm (Section 4.4)
http://www.liteachers.org/wankel/optics.html

Hope that helps.

 

[Furyline]

distance = rate x time

???

 

[Heisenberg]

Originally posted by: Random Variable
I know nothing about physics.

Me either.

 

[OneOfTheseDays]

buy an ageia

 

[Eeezee]

Use the book?

 

[drinkmorejava]

i just took the AP Physics test, there was only like one question on anything about light phases. In otherwords, no one cares.

 

[ArJuN]

I know some physics, atleast I'm taking it now. E = mc^2 is all you need to know. seriously. plug everything into there and you're good to go.
wtf is a wavetrain btw?

 

[xvdarkyvx21]

thanks for the website. http://www.fou.uib.no/fd/1996/h/404001/kap04.htm i believe that one has the info i need! thanks!

 

[Born2bwire]

Originally posted by: Furyline
distance = rate x time

???

Ahhaha, lucky guess.

 

[Hepafleb]

This part makes sense....

Originally posted by: ones3k
+ abcdefghijk/sqrt(z) + dslfksldkgsd

but this doesn't

Originally posted by: ones3k
coherence = c^2 + e^(sqrt(ln(pi))) + c*sigma(i = 0 to infinity)(2/i^(1.002)) + integral(from 0 to infinity) (12424/x^2)

 

[Eeezee]

Originally posted by: xvdarkyvx21
Can someone help me out with my physics homework? I need to answer this question and it deals with interference. Thanks.

"The coherence lenght of a wavetrain is the distance over which the phase constant stays the same. An atom of a light source emits coherent light for 10 ns. Calculate the coherence lenght of this wavetrain. c = 3*10^8 m/s"

If it's a phase constant then it should always stay the same

 

[Born2bwire]

Originally posted by: Eeezee

Originally posted by: xvdarkyvx21
Can someone help me out with my physics homework? I need to answer this question and it deals with interference. Thanks.

"The coherence lenght of a wavetrain is the distance over which the phase constant stays the same. An atom of a light source emits coherent light for 10 ns. Calculate the coherence lenght of this wavetrain. c = 3*10^8 m/s"

If it's a phase constant then it should always stay the same

Heh, but it's only constant for the 10 ns of light that was produced coherently. Seriously though, this is probably the most convoluted way you could state a d=r*t problem that I've heard.