A police siren passes you with a frequency of 5000 Hz. Which correctly describes the sound wave after the police car passes you? The speed of sound is 340 m/s.

(a) siren wavelength of 0.0068 meters, frequency you hear = less than 5000 Hz 

(b) siren wavelength of 0.0068 meters, frequency you hear = 5000 Hz

(c) siren wavelength of 5000 meters, frequency you hear = 5000 Hz 

(d) siren wavelength of 0.0068 meters, frequency you hear = more than 5000 Hz