AP Physics 1 Question 18: Answer and Explanation

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Question: 18

8. A beam of monochromatic light entering a glass window pane from the air will experience a change in

  • A. frequency and wavelength
  • B. frequency and speed
  • C. speed and wavelength
  • D. speed only

Correct Answer: C


C When a wave enters a new medium, its frequency does not change, but its wave speed does. Since λf = v, the change in wave speed implies a change in wavelength also.