A Whistle Is Whirled Around in a Horizontal Circle 120

question 187

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 is 343 m/s) .

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

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