Consider a lightwave having a phase velocity of 3 10 8 m/s and a frequency of

Question:

Consider a lightwave having a phase velocity of 3 × 10⁸ m/s and a frequency of 6 × 10¹⁴ Hz. What is the shortest distance along the wave between any two points that have a phase difference of 30°? What phase shift occurs at a given point in 10^-6 s, and how many waves have passed by in that time?

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