SAT Subject Physics Practice Question 291: Answer and Explanation
62. Which of the following best describes the relationship between the frequency and amplitude of a sound wave?
A. Frequency is proportional to amplitude.
B. Frequency is proportional to the square of the amplitude.
C. Frequency is inversely proportional to amplitude.
D. Frequency is inversely proportional to the square of the amplitude.
E. Frequency and amplitude are independent.
Correct Answer: E
The frequency determines the pitch of a sound, and the amplitude determines the intensity (or loudness). Pitch and loudness are independent. (A sound can be soft and low pitched, soft and high pitched, loud and low pitched, or loud and high pitched; there’s no connection.)