AP Physics 1 Question 163: Answer and Explanation

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Question: 163

3. A rock drops onto a pond with a smooth surface. A few moments later, the wave produced by the rock’s impact arrives at the shore, touching the ankles of a wading child. Which of the following observations provides evidence that the portion of the wave hitting the child’s ankles carries less energy than the wave did when it was first created by the rock’s impact?

  • A. The wave is moving more slowly.
  • B. The wave pulse’s width has become greater.
  • C. The wave pulse’s width has become smaller.
  • D. The wave’s height has become smaller.

Correct Answer: D

Explanation:

D-The energy carried by a wave depends on the wave's amplitude, meaning its height. The speed and pulse width or wavelength have no impact on the energy of a wave.