Pls help According to the Doppler Effect, why does a siren sound higher pitched as a vehicle drives toward a person, then lower pitched as the vehicle drives away? Question 38 options: The person's hearing cannot keep up with the moving vehicle. The vehicle had engine problems that made the sound change with distance. The sound waves are compressed as the vehicle drives toward the person and decompressed as the vehicle drives away. The sound waves are stronger as the vehicle drives toward the person and weaker as it drives away.