Practice Observation Of The Doppler Effect (7.1) - Waves and Sound

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6 sample questions

Question 1.
What happens to the pitch of a sound as the source approaches an observer?
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Think about how we describe sound in terms of 'higher' and 'lower'.
Question 2.
What is the Doppler Effect?
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Consider how sound changes when a vehicle moves.
3Question 3.
What is the Doppler Effect?
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Focus on motion between the source and the observer.
4Question 4.
When an observer moves towards a sound source, what happens to the frequency?
- It decreases.
- It remains the same.
- It increases.
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Think about the sound changes as something comes towards you.
Question 5.
A sound source moving at 30 m/s emits a sound of 800 Hz. If the observer is stationary, calculate the frequency heard when the source approaches.
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Make sure to plug in the right values for the variables.
Question 6.
An airplane is flying away from an observer at a speed of 150 m/s. The sound of its engines is at a frequency of 600 Hz. What frequency does the observer perceive?
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Identify the correct formula for when the source is moving away.

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