Question

A siren emits a sound wave with frequency f0. The graph shows the frequency you hear as you stand at rest at x = 0 on the x-axis. Which is the correct description of the siren's motion? f f0 0 1 2 3 4 t (s) A. It moves from left to right and passes you at t = 2 s. B. It moves from right to left and passes you at t = 2 s. C. It moves toward you for 2 s but doesn't reach you, then reverses direction at t = 2 s and moves away. D. It moves away from you for 2 s, then reverses direction at t = 2 s and moves toward you but doesn't reach you.

          A siren emits a sound wave with frequency f0. The graph shows the frequency you hear as you stand at rest at x = 0 on the x-axis. Which is the correct description of the siren's motion?
f
f0
0 1 2 3 4 t (s)
A. It moves from left to right and passes you at t = 2 s.
B. It moves from right to left and passes you at t = 2 s.
C. It moves toward you for 2 s but doesn't reach you, then reverses direction at t = 2 s and moves away.
D. It moves away from you for 2 s, then reverses direction at t = 2 s and moves toward you but doesn't reach you.

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A siren emits a sound wave with frequency f0. The graph shows the frequency you hear as you stand at rest at x = 0 on the x-axis. Which is the correct description of the siren's motion?
f
f0
0 1 2 3 4 t (s)
A. It moves from left to right and passes you at t = 2 s.
B. It moves from right to left and passes you at t = 2 s.
C. It moves toward you for 2 s but doesn't reach you, then reverses direction at t = 2 s and moves away.
D. It moves away from you for 2 s, then reverses direction at t = 2 s and moves toward you but doesn't reach you.

Added by Wayne R.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Madhur L

06/26/2023

Step 1

At t=0, the frequency you hear is equal to the frequency of the siren, fo. This means that the siren is stationary or moving parallel to the x-axis (not towards or away from you). Show more…

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A siren emits a sound wave with frequency f0. The graph shows the frequency you hear as you stand at rest at x = 0 on the x-axis. Which is the correct description of the siren's motion? A. It moves from left to right and passes you at t = 2 s. B. It moves from right to left and passes you at t = 2 s. C. It moves toward you for 2 s but doesn't reach you, then reverses direction at t = 2 s and moves away. D. It moves away from you for 2 s, then reverses direction at t = 2 s and moves toward you but doesn't reach you.

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