9) A driver travels northbound on a highway at a speed of30.0 m/s. A police car,

Question

9) A driver travels northbound on a highway at a speed of30.0 m/s. A police car, travelingsouthbound at a speed of 38.0 m/sapproaches with its siren producing sound at a frequency of 2500Hz.
(a) What frequency does the driver observe asthe police car approaches?

Hz
(b) What frequency does the driver detect by after the police carpasses him?
Hz
(c) Repeat parts (a) and (b) for the case when the police car istraveling northbound.
frequency as the police car approaches

Hz
frequency after the police car passes

Hz (a) What frequency does the driver observe asthe police car approaches?
Hz
(b) What frequency does the driver detect by after the police carpasses him? Hz
(c) Repeat parts (a) and (b) for the case when the police car istraveling northbound.
frequency as the police car approaches
Hz
frequency after the police car passes
Hz

Explanation / Answer

Given :    Speed of the driver car ( vd)  = 30 m/s Speed of the police car ( vp ) = 38.0m/s Speed of sound in the air ( v ) = 331 m/s Frequency of the police car ( n ) = 2500 Hz a )        The  frequencydoes the driver observe as the police car approaches      n' = ( v + vd / v - vp ) n         = ----- Hz b )       The frequency does the driverdetect by after the police car passes him      n' = ( v - vd / v + vd ) c )         when the police caris traveling northbound. frequency as the police car approaches
       n' = ( v - vd / v - vp )n           = ---Hz     n' = [ v + vd / v + vp ] n        = ------ Hz Plugin the values and solve it

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