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A travelling harmonic wave is represented by the equation y(x,t) = 10 –3 sin (50t + 2x), where, x and y are in mater and t is in seconds. Which of the following is a correct statement about the wave ?

1. The wave is propagating along the positive x-axis with speed 100 ms –1
2. The wave is propagating along the positive x-axis with speed 25 ms –1
3. The wave is propagating along the negative x-axis with speed 25 ms –1
4. The wave is propagating along the negative x-axis with speed 100 ms –1

Correct answer: The wave is propagating along the negative x-axis with speed 25 ms –1

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