SAT Subject Physics Practice Question 176: Answer and Explanation

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Question: 176

22. 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
E. wavelength only

Correct Answer: 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.

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