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A truck is traveling 70.0 kph away from you. The driver is blowing the horn, which has a frequency of 400 Hz. The air temperature is 25ÁC. What is the observed frequency of the horn?

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taskmasters

There are several information's already given in the question. Based on those information's the answer can be easily deduced.
Speed of the truck = 70 kph
                              = 19.44 m/s
Speed of sound = 343 m/s
Then
Observed frequency = 400 Hz ∗ 343 m/s/19.44m/s + 343 m/s
                                 = 378.54
                                 = 379 Hz

lydiawestfall11

Answer:

the answer is 379 Hz

Explanation:

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