Question: As it travels through a crystal, a light wave is described by the function E(x,t) = A cos [(1.54 107)x - (2.98 1015)t].

As it travels through a crystal, a light wave is described by the function E(x,t) = A cos [(1.54 × 107)x - (2.98 × 1015)t]. In this expression, x is measured in meters and t is measured in seconds. What is the speed of the light wave?

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