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Chapter 13: Problem 42

As a train approaches the next stop, the conductor blows the horn and applies the breaks on the train. What will a person standing at the train stop hear as the train approaches? (A) A decrease in the frequency and an increase in the intensity of the horn (B) An increase in the frequency and a decrease in the intensity of the horn (C) A decrease in both the frequency and intensity of the horn (D) An increase in both the frequency and intensity of the horn

Short Answer

Expert verified
(D) An increase in both the frequency and intensity of the horn.

Step by step solution

01

Understand the scenario and the concept of Doppler Effect

Given the scenario, the train (the source of the horn's sound) is moving towards the observer (a person standing at the train stop). According to the Doppler Effect, when a source of sound is moving towards the observer, the observed frequency is higher than the actual frequency. This causes the sound to seem higher-pitched than it actually is, i.e., it increases.
02

Understand the effect on the intensity of the horn

Intensity of sound is related to its amplitude and doesn't change due to the movement of the source. Therefore, the train's movement doesn't influence the horn's intensity. However, because sound seems louder as a source approaches, an observer at the train stop might perceive an increase in the intensity of the horn sound as the train gets closer.
03

Match the observed phenomenon with the choices

With a clear understanding of how the Doppler Effect impacts the observed frequency and intensity of the train's horn, it is possible to conclude that as the train approaches the observer at the train stop, there will be an increase in both the frequency and intensity of the horn.

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