Describe how the doppler effect explains why a siren has a lower pitch as a fire engine moves away from you. (need a short answer quick! )

Aspectroscope breaks light up into its colors, allowing scientists to analyze light from the solar system and universe. by studying the spectral line patterns, widths, strengths and positions, scientists can determine the speed, position, and of celestial bodies. a) age b) origin c) rotation d) temperature