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Which of the following equations represent a wave?

1. y = A sin ωt
2. y = A cos kx
3. y = A sin (ωt − kx)
4. y = A (ωt − kx)

Correct answer: y = A sin (ωt − kx)

Solution

The equation y = A sin (ωt − kx) represents a wave because it includes both time (t) and position (x) in a sinusoidal form, which is characteristic of wave motion.

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