Choose the one alternative that best completes the statement or answers the question. -Two pure tones are sounded together and a particular beat frequency is heard. What happens to the beat

Choose the one alternative that best completes the statement or answers the question.
-Two pure tones are sounded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is increased?
A) It does not change.
B) It increases.
C) It decreases.
D) It could either increase or decrease.

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