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A sinusoidal wave of wavelength 7.5 cm travels a distance of 1.2 cm along the x- direction in 0.3 sec. The crest P is at x = 0 at t = 0 sec and maximum displacement of the wave is 2 cm. Which equation correctly represents this wave?

1. y = 2cos(3.35x – 0.83t) cm
2. y = 2cos(0.83x – 3.35t) cm
3. y = 2sin(0.83x – 3.5t) cm
4. y = 2cos(0.13x – 0.5t) cm

Correct answer: y = 2cos(0.83x – 3.35t) cm

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