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The frequency of the sound will increase as the fire truck approaches, as the sound waves are compressed together, creating a higher pitch. As the fire truck passes by, the frequency will gradually decrease, as the sound waves spread out, creating a lower pitch.
The frequency of the sound produced by a fire truck siren changes as it approaches. This is because of the Doppler effect, which states that the frequency of sound waves increases as the source of the sound approaches, and decreases as it moves away.
Step 1: When the firetruck is at rest, the sound waves emitted by the siren travel in a straight line in all directions. This means that the frequency of the sound waves heard at any given point is the same as the frequency emitted by the siren.
Step 2: As the fire truck moves closer to the observer, the sound waves leave the siren at a faster rate than when the truck was at rest. This causes the sound waves to bunch up closer together, which in turn causes the frequency of the sound to increase.
Step 3: As the fire truck continues to move closer to the observer, the sound waves continue to bunch up, resulting in an even higher frequency of sound.
Step 4: Finally, when the fire truck passes the observer, the sound waves start to spread apart again. This causes the frequency of the sound to decrease.
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