MCAT Physics Question 109: Answer and Explanation
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Question: 109
4. When monochromatic light is refracted as it passes from air to glass, which of the following does NOT remain the same? (Note: Assume that the wave is fully transmitted.)
- A. Wavelength
- B. Frequency
- C. Amplitude
- D. Period
Correct Answer: A
Explanation:
As light rays travel from one medium to another, their wavelengths change. Even if we did not know this immediately, we can determine the answer through process of elimination. Frequency and period are inverses of each other, so if either of these quantities changes, the other would have to change as well, eliminating choices (B) and (D). Further, because the wave is fully transmitted, there is no absorption or reflection, and the amplitude (which is related to intensity) should not change, eliminating choice (C). When light is refracted, its speed changes; although the frequency does not change, the wavelength does.