AP Physics 1 Question 117: Answer and Explanation
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Two sounds are played in the laboratory. A microphone is connected to an oscilloscope, which displays the traces shown above for each sound. On these traces, the horizontal axis is time; the vertical axis is related to the distance the microphone’s diaphragm is displaced from its resting position. The scales are identical for each diagram. Which of the following is correct about the sounds that produce the traces above?
- A. Sound 1 is louder, and sound 2 is higher pitched.
- B. Sound 2 is louder, and sound 2 is higher pitched.
- C. Sound 1 is louder, and sound 1 is higher pitched.
- D. Sound 2 is louder, and sound 1 is higher pitched.
Correct Answer: C
C-The amplitude of a sound is related to the loudness. Sound 1 has higher amplitude, so it is louder. The pitch of a sound is related to the frequency. Since the horizontal axis is time, the peak-to-peak distance corresponds to a period, which is the inverse of the frequency. Sound 1 has a smaller period, so it has a larger frequency and a larger pitch.