The beats frequency (sensible) for a human car is _____________________?
Correct answer: B. 7 Hz
- A. 42Hz
- B. 7 Hz
- C. 256Hz
- D. 262Hz
Explanation
Beat frequency is the absolute difference between the frequencies of two close sounds, fbeat = |f1 - f2|. Among the choices, 7 Hz is the sensible beat frequency and lies within the commonly audible range of beats. A student may choose 42 Hz by confusing one of the source frequencies with their difference.
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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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