Finding intensity from the Poynting vector

[OhNoYaDidn't]

Homework Statement

[/B]

Homework Equations

The Attempt at a Solution

I found the expression for the magnetic field, and then the Poynting vector.

If i find the intensity, that's the same as finding the average value of the Poynting vector, and the cos^2 disappears... Can you tell me what to do next?
Thank you.

 

[OhNoYaDidn't]

Bump Bump. Does anyone know what to do next?

 

[SammyS]

Bump Bump. Does anyone know what to do next?

Please observe the Forum Rule regarding bumping.

Bumping
Do not "bump" one of your threads to the top of a forum's thread list by posting a basically empty message to it, until at least 24 hours have passed since the latest post in the thread; and then do it only once per thread.​

 

[SammyS]

Homework Statement

[/B]

Homework Equations

The Attempt at a Solution

I found the expression for the magnetic field, and then the Poynting vector.

If i find the intensity, that's the same as finding the average value of the Poynting vector, and the cos^2 disappears... Can you tell me what to do next?
Thank you.

What does the Poynting vector tell you about the wave's intensity? What are it's units?

How is the speed of light, c, related to ε₀ and μ₀ ?

 

[OhNoYaDidn't]

I wasn't aware of that rule, thank you for pointing it out.
The intensity is the mean value of the Poynting vector. The units of the Poynting vector are W.m^-2, the same for intensity..
I can use the retation c=1/sqrt(ε0*μ0), and therefore reducing 1/cε0 = sqrt(ε0/μ0). What should i do next?

Thanks for your reply.