a Whistle Is Whirled Around in a Horizontal Circle

question 47

Multiple Choice

. A whistle is whirled around in a horizontal circle 120 times a minute at the end of a piece of string 1.5 m in length.If the standard frequency of the whistle is 550 Hz,calculate the difference between the highest and lowest frequencies heard by a stationary observer (assume the speed of sound in air = 343 m/s) .

• A)58 Hz
• B)64 Hz
• C)61 Hz
• D)32 Hz
• E)29 Hz

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