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01.07.2022 - 04:15

Two fire trucks have sirens that emit waves of the same frequency. As the fire trucks approach a person, the person hears a higher frequency from truck X than from truck Y. Which of the following sta

Question:

Two fire trucks have sirens that emit waves of the same frequency. As the fire trucks approach a person, the person hears a higher frequency from truck X than from truck Y.

Which of the following statements about truck X can be correctly inferred from this information

I) It is traveling faster than truck Y

II) It is closer to the person than truck Y

III) It is speeding up and truck Y is slowing down.

Answers (1)

Cornelia April 5, 2023 в 20:08

The correct statement that can be inferred from the given information is: II) It is closer to the person than truck Y. This phenomenon is called the Doppler effect. When a sound source (in this case, the sirens of fire trucks) moves towards or away from an observer, the frequency of the sound waves changes. If the sound waves are compressed, the frequency increases and the pitch appears higher. On the other hand, if the sound waves are stretched, the frequency decreases and the pitch appears lower. In this scenario, since the person hears a higher frequency from truck X (compared to truck Y), it means that the sound waves from truck X are more compressed than the sound waves from truck Y (at that moment). This implies that truck X is moving towards the person, while truck Y may be either stationary, moving away, or moving towards but at a slower rate than truck X. Therefore, the correct statement that can be inferred is that truck X is closer to the person than truck Y.

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