a) Consider interference of two wavefronts with equal amplitudes but slightly different wavelengths lambda = 2...
For this problem, consider the sum of two slightly different waves with similar electric fields: v1(z,t) = sin(wt - kz) v2(z,t) = sin([w + Dw]t - [k + Dk]z) Derive analytically an expression for the group and phase velocity for the sum of the two fields. HINT: sin(a) + sin(b) = 2 sin[(a+b)/2]cos[(a-b)/2]