Read and answer: When two notes are played that have very close (but not identical) frequencies, it sounds like a single note of a constant pitch that gets louder and softer at a beat frequency equal to the difference in the frequencies of the individual sounds.Which of the following would decrease the beat frequency of the combined sound?

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Read and answer: When two notes are played that have very close (but not identical) frequencies, it sounds like a single note of a constant pitch that gets louder and softer at a beat frequency equal to the difference in the frequencies of the individual sounds.<br>Which of the following would decrease the beat frequency of the combined sound?