The periodic alternation of sound between maximum and minimum loudness are called___________________?
Correct answer: C. beats
- A. silence zone
- B. interference
- C. beats
- D. resonance
Explanation
The repeated rise and fall of sound loudness occurs when two close frequencies interfere, producing alternating constructive and destructive interference. This phenomenon is called beats. Interference is the underlying process, but beats is the specific observable periodic alternation in loudness, so students may choose interference as the broader term.
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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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