If a sound source is moving away from a stationary observer, which of the follow

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Question: If a sound source is moving away from a stationary observer, which of the following describes the observed frequency?

Options:

Correct Answer: Lower than the source frequency

Solution:

The observed frequency decreases as the source moves away, due to the Doppler effect.

If a sound source is moving away from a stationary observer, which of the following describes the observed frequency?

If a sound source is moving away from a stationary observer, which of the following describes the observed frequency?

Step 1: Understand that a sound source is something that makes noise, like a car horn.
Step 2: Recognize that a stationary observer is a person who is not moving, like someone standing on the sidewalk.
Step 3: Know that when the sound source moves away from the observer, the sound waves get stretched out.
Step 4: Realize that stretching the sound waves makes the sound less frequent, which means a lower pitch.
Step 5: Conclude that the observed frequency of the sound decreases as the source moves away.

Doppler Effect – The change in frequency or wavelength of a wave in relation to an observer moving relative to the wave source.
Relative Motion – Understanding how the motion of the source affects the frequency perceived by an observer.