3.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 increases.
(B) It decreases.
(C) It does not change.
(D) It becomes zero.
(E) We cannot tell from the information given.

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統計: A(0), B(0), C(0), D(0), E(25) #3081243

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