Phase and Group Velocity: Multiple Scenarios in one Shot | Part 6

[@Nick26021996]

Excellent animation, thank you so much for doing it!

[@meyavuz]

Thanks Nico. Glad to hear that

[@akhilbiju3245]

hello, what is the value of delta w and delta k thank u

[@meyavuz]

Here are the values I have utilized: Randomly chosen and fine tuned. ``` n1= 1.0; n2 = 1.1; c = 3; f1 = 1; f2 = 1.0 - 0.090910; f3 = 1.0 + 0.2; f4 = 1.0; lambda1 = c/(f1*n1); lambda2 = c/(f2*n2); lambda3 = c/(f3*n2); lambda4 = c/(f4*n2); w1 = 2*pi*f1; w2 = 2*pi*f2; w3 = 2*pi*f3; w4 = 2*pi*f4; k1 = 2*pi/lambda1 * n1; k2 = 2*pi/lambda2 * n2; k3 = 2*pi/lambda3 * n2; k4 = 2*pi/lambda4 * n2; ```

[@akhilbiju3245]

@@meyavuz thanks 😁

[@meyavuz]

@@akhilbiju3245 welcome

[@ВладимирСтригалев-е7у]

One question. There are equal frequencies for f1 and f4, but different wavelength in sample where Vg=0. Group velocity is a characteristic for telecommunication and this case is impossible.

[@meyavuz]

But f1 and f4 do not have same frequencies., they are different. Just stop and count the peaks you will see the difference in frequency. So that scenario theoretically can be obtained