AP Physics 1 Question 257: Answer and Explanation
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3. A transverse wave on a long horizontal rope with a wavelength of 8 m travels at 2 m/s. At t = 0, a particular point on the rope has a vertical displacement of +A, where A is the amplitude of the wave. At what time will the vertical displacement of this same point on the rope be -A ?
- A. t = s
- B. t = s
- C. t = 2 s
- D. t = 4 s
Correct Answer: C
The time interval from a point moving from its maximum displacement above y = 0 (equilibrium) to its maximum displacement below equilibrium is equal to one-half the period of the wave. In this case,
so the desired time is (4 s) = 2 s.