![Physics](/tpl/images/cats/fizika.png)
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Use the information in the lesson to answer the questions in Part One, then use the Doppler Effect Activity to complete Part Two. You may use the lesson, your notes, and the activity, but all answers must be in your own words.
Part One: Wave Facts
What type of waves can only travel through a medium?
What is pitch?
What is the relationship between amplitude and volume?
How does the type of medium affect a sound wave?
Describe the relationship between frequency and wavelength.
Part Two: Doppler Effect Activity
In this activity, you will examine sound waves as they are emitted from a moving source. Predict what will happen to the sound waves when the sound source is in motion.
Record your prediction (hypothesis) as an “if then” statement. (For example: If you select the GO button, then the train will move)
If the sound source is moving then the pitch of the sound will to the observer.
Select the boy icon. Select the lowest pitch by selecting the bottom music note located to the bottom right of the lab activity. Select the GO button. What happened to the pitch of the sound as the sound source moved past the observer? Record your observations.
Select the reset button on the lab activity. Select the boy icon. Select the middle note located in the bottom right of the lab activity. Select the GO button. What happened to the pitch of the sound as the sound source moved past the observer? Record your observations.
Select the reset button on the lab activity. Select the boy icon. Select the highest note located in the bottom right of the lab activity. Select the GO button. What happened to the pitch of the sound as the sound source moved past the observer? Record your observations.
Why did the boy (the observer) hear the pitch of the sound change? What does this tell us about the frequency of the sound? Support your conclusion based on results from the experiment and your knowledge of sound waves.
Describe at least two ways that your understanding of the Doppler effect could be applied to everyday life.
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