1. The problem statement, all variables and given/known data Two waves of different wavelengths λ1= 1.5μm, λ2 = 1.63μm, are combined in free space Et = 1.5cos(k1x - ω1t) + 2cos(k2x -ω2t) Find the beat frequency 2. Relevant equations (ω1- ω2) = 2ωm=beat frequency E02 = 4E012cos2(kmx - ωmt) 3. 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?