Question

The Doppler effect is best known as a change in the _______ of a wave as the source is moving with respect to the observer.
Responses
A frequencyfrequency
B pitchpitch
C motionmotion
Question 2
There is ___________ shift in sound frequency for observers towards whom the source is approaching.
Responses
A a downwarda downward
B an upwardan upward
C nono
Question 3
Which statement explains why the sound of ambulance suddenly drops as it passes and travels away from you?
Responses
A The distance between sound waves is increased.The distance between sound waves is increased.
B The distance between sound waves is decreased.The distance between sound waves is decreased.
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Answer 1

Here are the answers to your questions regarding the Doppler effect:

**Question 1: The Doppler effect is best known as a change in the _______ of a wave as the source is moving with respect to the observer.**
**Answer:** A. frequency

**Question 2: There is ___________ shift in sound frequency for observers towards whom the source is approaching.**
**Answer:** B. an upward

**Question 3: Which statement explains why the sound of an ambulance suddenly drops as it passes and travels away from you?**
**Answer:** A. The distance between sound waves is increased.

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