Two Trumpet Players Are Both Playing a Pitch with a Frequency

question 40

Multiple Choice

Two trumpet players are both playing a pitch with a frequency of 440 Hz,corresponding to the musical pitch A above middle C.However,one of the trumpet players is marching away from you so that you hear a beat frequency of 4 Hz from the two trumpets.With what speed is the departing trumpet player moving away from you? (The speed of sound in air is 340 m/s)

• A)3.12 m/s
• B)3.09 m/s
• C)3.06 m/s
• D)3.00 m/s
• E)2.95 m/s

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