SUPERPOSITION OF WAVES Activity 3: Apply What You've Learned Analyze the situations below by applying what you have learned in lesson 3 and answer the given questions. 1. Two fire trucks with sirens on speed towards and away from an observer as shown below. LO A. Which truck produces a higher than normal siren frequency? B. Which truck produces a lower than normal siren frequency? C. Which sound property describes how high or low a sound seems to a person? 2. The police car has passed the woman standing on the sidewalk, but not yet passed the man. Which observer hears the siren at a higher pitch