Four beats per second are heard when two notes are sounded. The frequency of one note is 420 Hz. Which of the following is a possible frequency of the other note?
Answer:
when two sound waves of different frequency approach your ear, the alternating constructive and destructive interference causes the sound to be alternatively soft and loud - a phenomenon which is called beating or producing beats. The beat frequency is equal to the absolute value of the difference in frequency of the two waves.
so the possible frequency of the other note is 424 or 416
ie 420-4 = 416
or 420+4=424
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