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# Doppler Effect (Grades 11-12)

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## Doppler Effect

Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.

1.
Explain the Doppler Effect. Include a real-world example in your explanation.

2.
Use the information in the scenario of the following question to answer the next two questions.
A.
Sitting on a bench outside the Art Institute of Chicago one afternoon, Javier finds himself beneath the flight path of the airplanes leaving O’Hare Airport. What frequency will Javier hear as a jet, whose engines emit sound at a frequency of 1000 Hz, flies towards him at a speed of 100.0 m/s? ($v_"sound"=343m/s$)

B.
What frequency will Javier perceive as the jet travels away from him at the same speed?

3.
An eagle chases a rabbit with a speed of 20 m/s, while screaming at a frequency of 3400 Hz. What frequency of sound does the rabbit hear as he runs away from the eagle with a speed of 15 m/s?

4.
As your drive past the high school practice field, your speedometer reads 20 mph (9 m/s). Driving away at the same speed, you hear a coach's whistle, with a frequency of 13,000Hz, being blown. What frequency do your ears perceive as you drive away?

5.
The Doppler Effect causes a change in perception of the pitch of source of sound because in the same period of time
1. if the distance between source and observer increases, the waves must spread out.
2. if the distance between source and observer decreases, the waves must be compressed.
3. the same number of waves must fit between the source and the observer.
4. All of the above are correct.
6.
Use the information in the honey bee scenario to answer the next three questions.
A.
The buzzing of a honey bee’s wings in emitted at a frequency of 230 Hz. If you hear a bee buzzing at a frequency of 200 Hz while sitting in the garden, is the bee headed towards you or away from you?

B.
What is the velocity of the super fast honeybee?

C.
What is the wavelength of the buzzing you perceive?

7.
While standing in the 42nd Street and Times Square subway station, Rodney hears the incoming screech, registering at 4000Hz, of an express train speeding through the station at 18 m/s. What is the frequency of the approaching train that is perceived by Rodney’s ears?$f=f_0((v_"sound"+v_o)/(v_"sound"-v_s))=$

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