Exercises 4.2: Plane waves--infinite medium

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4.2.1 The figures show the "born" display at two different times of a traveling wave moving to the right. The clock measures time in units of 10^(-14) s and the lattice constant is 2 Angstroms.

A: What is the wave vector of this wave?

B: What is its phase velocity?

C: What is its angular frequency?

D: Find an alternative pair of answers to B and C.