Sound Doppler

Lab Sheet
1. In the lab 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, as it get closer to the person it will get louder and the farther away it gets it starts to fade.
2. 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 volume of the sound as the sound source moved past the observer? Record your observations.
As the sound sourced moved the volume gradually got louder until it passed the boy, then it faded away the farther ways it got.
3. Click your mouse in any area on the page. 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.
As the sounder moved past the boy it slurred the music notes as went past him.
4. Click your mouse in an area on the page. 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. Describe the volume and pitch of the sound as the sound source moved past the observer? Record your observations.
As the sound source moved past the observer the volume got loud, but it faded off and slurred just as it was almost all the way past him.
5. Did the experiment prove or disprove your hypothesis? Support your conclusion based on results from the experiment and your knowledge of sound waves.
The experiment proved my hypothesis and added to my hypothesis. As I mentioned that the closer the sound, the louder it seems, and the farther away it get the fainter it is. Also I noticed how the sound slurs when going pass.
6. What properties of sound determine the pitch of sound? How is this affected by motion of the sound source? Be specific.
Frequency, the more the frequency the higher the pitch.
7. What properties of sound determine the volume of sound? Is this affected by the motion of the sound source?
The sound pressure determines the volume. Yes it is affected by the motion for example a loudspeaker.
8. If the pitch of a sound decreases and the sound source is moving, is the sound source moving toward or away from the observer?
The sound source is moving away from the observer.
9. Describe at least two ways that your understanding of the Doppler Effect could be applied to everyday life.
A train passing by your house, if you live close to the tracks, and or standing by the tracks.
Someone running past at full speed while you’re standing still.