Beat frequency from radio waves with wavelengths 3.141m and 3.135m

[adashiu]

Homework Statement

What would be the beat frequency if radio waves of wavelength 3.141m and 3.135 are mixed?

The Attempt at a Solution

I need frequency of wave1 and wave2, because Fb=|f1-f2|
But i don't have nothing but wavelength...
Any hints?

 

[Hootenanny]

Can you work out the frequency?

HINT: At what speed do radio waves travel?

 

[adashiu]

I have no idea... Where can I find that?

 

[Hootenanny]

I have no idea... Where can I find that?

Another hint: Radio waves are electromagnetic waves. At what speed do all EM waves travel at?

 

[adashiu]

Iw as trying but no idea at all...

 

[just__curious]

What speed does light travel at?