AP Physics 1 Question 18: Answer and Explanation
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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.