The number of beats produced per second is equal to____________________?
Correct answer: B. the difference of the frequencies of two tuning forks
- A. the sum of the frequencies of two tuning forks
- B. the difference of the frequencies of two tuning forks
- C. the ratio of the frequencies of two tuning forks
- D. the frequency of either of the two tuning forks
Explanation
The beat frequency is the absolute difference between the two source frequencies, fbeat = |f1 - f2|, measured in hertz or beats per second. For example, sources of 256 Hz and 260 Hz produce |260 Hz - 256 Hz| = 4 Hz. The likely mistake is choosing the sum, which is not the rate of loudness variations.
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About Superposition and Interference
Superposition states that overlapping waves produce a resultant displacement equal to the algebraic sum of their individual displacements. Interference covers constructive and destructive interference, phase difference, path difference, coherent sources, and conditions for maxima and minima. It differs from diffraction, which involves spreading around openings or obstacles.
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