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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Definitions:

Distillation

A process of purifying liquids through heating and cooling, separating components based on differences in boiling points.

Flooding

An overflow of water onto land that is normally dry, often the result of heavy rain, snowmelt, or obstruction of water flow.

Channelization

The engineering of a natural stream or river by straightening, deepening, or otherwise modifying its natural course for navigation, flood control, or urban development.

Wetlands

Areas where water covers the soil, either permanently or seasonally, supporting distinct ecosystems with a variety of plant and animal life.