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## Homework Statement

Two waves of different wavelengths λ

_{1}= 1.5μm, λ

_{2}= 1.63μm, are combined in free space E

_{t}= 1.5cos(k

_{1}x - ω

_{1}t) + 2cos(k

_{2}x -ω

_{2}t)

Find the beat frequency

## Homework Equations

(ω

_{1}- ω

_{2}) = 2ω

_{m}=beat frequency

E

_{0}

^{2}= 4E

_{01}

^{2}cos

^{2}(k

_{m}x - ω

_{m}t)

## The Attempt at a Solution

I am quite stuck on this problem. Can I get a numerical solution for question with what I've been given?