Aperson listening to a siren from a stationary police car observes the frequency and wavelength of that sound. the car now drives rapidly away from the person.
o the wavelength of the sound the person observes will be shorter than it was, but the frequency will not be changed.
o the frequency of the sound the person observes will be higher than it was, but the wavelength will not be changed.
o the wavelength of the sound the person observes will be longer than it was, and the frequency will also be lower than it was.
o the wavelength of the sound the person observes will be shorter than it was, and the frequency will also be higher than it was.