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Let's work through the physics questions related to waves and sound:

1. **When an automobile moves towards a listener, the sound of its horn seems relatively**  
   Answer: **b. high pitched**  
   - Explanation: Due to the Doppler effect, as the car approaches, the frequency of the sound waves increases, making the pitch higher.

2. **When the automobile moves away from the listener, its horn seems**  
   Answer: **a. low pitched**  
   - Explanation: As the car moves away, the frequency of the sound waves decreases, making the pitch lower.

3. **The changed pitch of the Doppler effect is due to changes in**  
   Answer: **b. wave frequency**  
   - Explanation: The Doppler effect affects the frequency of the sound waves, which in turn alters the pitch.

4. **Circle the letter of each statement about the Doppler Effect that is true.**  
   Correct statements:  
   **a. It occurs when a wave source moves towards an observer.**  
   **c. It occurs when a wave source moves away from an observer.**  
   - Explanation: The Doppler effect applies in both cases—when the source moves towards or away from the observer.

5. **True/False: A moving wave source does not affect the frequency of the wave encountered by the observer.**  
   Answer: **False**  
   - Explanation: The moving wave source changes the frequency experienced by the observer, as seen in the Doppler effect.

6. **True/False: A higher frequency results when a wave source moves towards an observer.**  
   Answer: **True**  
   - Explanation: As the wave source moves towards the observer, the wave frequency increases, resulting in a higher pitch.

7. **Two fire trucks with sirens on speed towards and away from an observer as shown.**  
   **a) Which truck produces a higher-than-normal siren frequency?**  
   Answer: The **left** truck (moving towards the observer).  
   - Explanation: Due to the Doppler effect, the frequency increases when the truck is moving towards the observer.

   **b) Which truck produces a lower-than-normal siren frequency?**  
   Answer: The **right** truck (moving away from the observer).  
   - Explanation: The frequency decreases when the truck is moving away from the observer.

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Would you like further clarification on any of these concepts? 

Here are five follow-up questions to deepen your understanding:

1. How does the Doppler effect apply to light waves, not just sound?
2. Why does the Doppler effect not change the speed of sound, only its frequency?
3. Can the Doppler effect occur if both the source and observer are stationary?
4. What would happen to the pitch of a sound if the observer moves towards a stationary sound source?
5. How does the speed of the wave source affect the magnitude of the Doppler effect?

**Tip:** The Doppler effect also applies in astronomy, where it helps to measure the speed and movement of stars and galaxies through redshift and blueshift.

WAVES and SOUND Worksheet, including questions about Doppler effect and sound frequency.

This worksheet covers key concepts in physics, such as the Doppler effect, sound waves, and changes in pitch due to motion. It is suitable for high school students learning about wave mechanics and the behavior of sound.

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