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Mechanical Properties of Fluids
Question
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A whistle is being revolved in a circle. What changes in the frequency of the whistle appear to a person standing outside the circle?

Answer

The person will observe the frequency to be changing between maximum and minimum values.
During one complete rotation of whistle, the person will observe maximum frequency higher than actual frequency once.
The minimum frequency lower than the actual frequency will be observed once 
Once minimum frequency lower than actual frequency and two times actual frequency. 

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