A siren moving with a constant speed emits a sound wave with frequency fo. The graph shows the frequency you hear as you stand at rest at x = 0 on the x-axis. Which of the following is the best description of the siren's motion? (a) it moves from left to right and passes you at t = 2s, (b) it moves from right to left and passes you at t = 2s, (c) it moves toward you for 2s, but doesn't reach you, then reverses Jo- direction at t = 2s, and moves away, (d) it moves away from you for 2s, then reverses direction at t = 2s and moves toward you but doesn't reach you, (e) none of the above are correct. 0 1 2 3 4 1 (s)

A siren moving with a constant speed emits a sound wave with frequency fo. The graph shows the frequency you hear as you stand at rest at x = 0 on the x-axis. Which of the following is the best description of the siren's motion? (a) it moves from left to right and passes you at t = 2s, (b) it moves from right to left and passes you at t = 2s, (c) it moves toward you for 2s, but doesn't reach you, then reverses Jo- direction at t = 2s, and moves away, (d) it moves away from you for 2s, then reverses direction at t = 2s and moves toward you but doesn't reach you, (e) none of the above are correct. 0 1 2 3 4 1 (s)