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Posts: 3561
12 years ago
A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it goes away from a stationary pedestrian. What frequency does the pedestrian hear? The speed of sound in air is 343 m/s.
A) 378 Hz
B) 389 Hz
C) 411 Hz
D) 422 Hz
E) 450 Hz
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Educator
12 years ago
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