1. (a) Define the Doppler effect in your own words. 5. You are in a car moving at 90 km/h, and you see someone (b) Give two examples of the Doppler effect from your at the side of the highway. You use your horn to warn the experience that are not given in this section. K/u c A person. The frequency of the horn is 440 Hz, and the air 2. Explain why a sound wave has a higher frequency when temperature is 0 C. Calculate the frequency of the horn the source is approaching a stationary observer. k/u the person hears as you approach and as you pass. TA 3. A source emitting a sound at 300.0 Hz is moving toward an 6. A source passing a stationary observer is emitting a observer at 25 m/s. The air temperature is 15 C. What is frequency of 560 Hz. If the speed of sound is 345 m/s, the frequency detected by the observer? K/u what must the speed of the source be if the frequency 4. A fire truck emitting a 450 Hz signal passes by a stationary source is 480 Hz? K/U T/1 detector. The difference in frequency measured by the 7. Describe what happens to the frequency as a source detector is 58 Hz. If the speed of sound is 345 m/s, how of sound passes a stationary observer. Is this effect fast is the fire truck moving? k/u instantaneous? Explain. K/uSPH3U The Doppler Effect Worksheet The Doppler Effect when a source of sound approaches an observer, the observed frequency of the sound increases (sounds ? ) - when the source moves away from an observer, the observed frequency of the sound decreases. (sounds ? )