A whistle emitting a sound of frequency `440 Hz` is tied to a string of `1.5 m` length and roated with an angular velocity of `20 rad//s` in the horizontal plane. Calculate the range of frequencies heard by an observer stationed at a larger distance from the whistle .(Speed of sound =`330 m//s)` .

Answer

`403.3 Hz` to 484 Hz

Explanation

`Deltaf_(1)=f_(0)((v)/(v-v_(S)))=440((330)/(330-20xx1.5))=484Hz`
`f_(2)=f_(0)((v)/(v+v_(S)))=440((330)/(330+20xx15"))=403.3Hz`