As a person walks towards the speaker, the frequency he or she hears

Question

BlackTom AI · Accepted Answer

When a listener moves toward a sound source, the waves in front of the listener are encountered more frequently, causing the observed frequency to rise due to the Doppler effect. 
Option 1: Increase — this matches the Doppler shift for a moving observer approaching a stationary source; the wavelength in the observer's frame is compressed, leading to a higher perceived frequency. 
Option 2: Remains the same — incorrect because motion toward the source alters the relative motion between source and observer, changing the frequency; it does not stay constant. 
Option 3: Decreases — this would occur if the observer were moving away from the source, not toward it; the relative motion increases the frequency when approaching. 
Option 4: Increases or decreases, depending on temperature — temperature does not determine the Doppler shift in this scenario; the shift is governed by relative motion, not by environmental temperature, so this option is not accurate.

SPHY001 Practice Quiz - Unit 18 | LA058

As a person walks towards the speaker, the frequency he or she hears

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SPHY001 Practice Quiz - Unit 18 | LA058

As a person walks towards the speaker, the frequency he or she hears

查看解析

登录即可查看完整答案

类似问题

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.

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

How will your perceived frequency change if the source is moving towards you?

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

You are standing on the side of the road and a car with a loud siren goes past you. As it moves away you can expect the sound to become _______ and the wavelength to become_________.

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

If at a concert you run toward the orchestra, the frequency of the sound you hear will be

If we observe one edge of a star to be redshifted and the opposite edge to be blueshifted, what can we conclude about the star?

更多留学生实用工具

希望你的学习变得更简单

You are standing on the side of the road and a car with a loud siren goes past you. As it moves away you can expect the sound to become _ and the wavelength to become___.