Question

The figure to the right shows a travelling wave moving in the positive x direction. At time t = 0 s, the wave plotted as a function of position has the shape shown by the light curve, and at t = 3 s, the shape shown by the bold curve.

The following six panels show plots as a function of time, at the position x = 0.

Which of the panels represent possible shapes of the travelling wave?

• A. 4 and 6
• B. 1 and 3
• C. 1,2 and 3
• D. 1 and 4

Answer 1

The correct option is B 1 and 3

Options 1, 2 and 3 show waves travelling in the positive x-direction, but only 1 and 3 have $y=0\text{m}$ at $t=3\text{s}$.