A) The wavelength of the sound the person observes will be shorter than it was,

Question

       A) The wavelength of the sound the person observes will be shorter than it was, but the frequency will not be changed.
       B) The frequency of the sound the person observes will be higher than it was, but the wavelength will not be changed.
       C) The wavelength of the sound the person observes will be shorter than it was, and the frequency will be higher than it was.

       D) The wavelength of the sound the person observes will be longer than it was, and the frequency will be higher than it was.

       E) orange

A person listening to a siren from a stationary police car from a distance observes the frequency and wavelength of that sound. The police car now drives rapidly towards the person.

Explanation / Answer

this question will be solved by doppler effect

source is coming towards the detecter

f' = (V/(V-Vs)) * f

here vo = 0 detector is stationary so priginal frequency will increase and sound of velocity is constant , compensate to this wavelegth must be shorter

C) The wavelength of the sound the person observes will be shorter than it was, and the frequency will be higher than it was.

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