esign
References Mailings Review
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.
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1. Record your prediction (hypothesis) as an "if then" statement. (For example: If you select the
GO button, then the train will move)
to the
If the sound source is moving then the pitch of the sound will
observer.
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 pitch of the
sound as the sound source moved past the observer? Record your observations.
3. 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.
4. 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.
5. Why did 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.
6. Describe at least two ways that your understanding of the Doppler effect could be applied to
everyday life.
