4-3) Group Velocity of ZnSe. Using the Sellmeier coefficients in the formula below, calculate the following properties of ZnSe at 20 = 0.550 μm. I (a) The refractive index n; (b) The phase velocity in m/s; (c) The group velocity in m/s; (d) The group index N. n² = 1+ + 4.45814-202 22-(0.200860) 2,2-(0.391371)2 2,2-(47.1362)² 0.467216.202 2.89566-202 + (λ, in μm)

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Which of the following processes is used in social media monitoring?   Question 4 options:   a)  ​Crowdsourcing   b)  ​Cold calling   c)  ​Personal selling   d)  ​Sentiment analysis