The source of a sound moves away from the listener. The listener has the impression that the source

Question

BlackTom AI · Accepted Answer

The prompt describes a scenario where the source of a sound moves away from the listener, and we are to infer how the listener perceives the sound.
Option 1: 'Higher in amplitude' would imply a louder sound, which occurs if the source moves toward the listener or if there is a gain in energy; however, Doppler or acoustic effects of moving away typically do not produce an increase in amplitude as the primary perceptual change when distance increases. So this is unlikely.
Option 2: 'Lower in velocity' refers to the speed of the sound wave itself; the speed of sound in a medium is determined by the medium and conditions, not by the motion of the source relative to the observer in a way that alters perceived velocity as a straightforward percept. Therefore this option misidentifies how motion affects perception.
Option 3: 'Remains unchanged' would mean there is no perceptual change when the source recedes, but in real listening scenarios, distance and relative motion usually alter perception through changes in pitch and loudness, so this is not accurate.
Option 4: 'Lower in pitch' describes the Doppler effect as the source moves away: the frequency heard by the observer decreases, which is perceived as a lower pitch. This aligns with the standard explanation of how relative motion affects perceived frequency and is the most consistent choice with the given scenario.
In summary, the options above contrast loudness, perceived speed, and pitch changes. The critical cue in the question is the source moving away, which most directly leads to a decreased perceived frequency (lower pitch) due to the Doppler effect, while amplitude and velocity perceptions are not the primary or reliable outcomes in this context. The 'Remains unchanged' stance ignores common acoustic phenomena related to moving sources, making it an incorrect interpretation.

SPHY001 Practice Quiz - Unit 18 | LA058

The source of a sound moves away from the listener. The listener has the impression that the source

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SPHY001 Practice Quiz - Unit 18 | LA058

The source of a sound moves away from the listener. The listener has the impression that the source

View Explanation

Log in for full answers

Similar Questions

You stand by the railroad tracks as a train passes by. You hear a 950-Hz frequency when the train approaches, which changes to 820 Hz as it goes away. How fast is the train moving? The speed of sound in air is 340 m/s.

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In which of the following situations is the Doppler effect absent?

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The Doppler effect occurs when the source of a wave is moving. This causes the _____ of the wave to change.

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More Practical Tools for Students Powered by AI Study Helper

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