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

Question

BlackTom AI · Accepted Answer

The question asks about situations in which the Doppler effect is absent. Let's evaluate each option in turn.
Option 1: Neither the source nor the observer is moving relative to one another. In this scenario there is no relative motion, so the distance between them does not change and the frequency of the waves detected is the same as emitted. Therefore, no Doppler shift occurs.
Option 2: The observer is moving toward the source. When the observer moves toward the source, they encounter waves more frequently, leading to a higher observed frequency (a blue shift) due to relative motion, so the Doppler effect is present.
Option 3: The source and the observer are moving towards each other. Here there is relative motion bringing waves closer together, which increases the observed frequency; a Doppler shift occurs in this case as well.
Option 4: The source is moving away from the observer. As the source recedes, the waves are stretched and the observer receives waves less frequently, resulting in a lower observed frequency (a red shift). This is another manifestation of the Doppler effect.
In summary, any situation involving relative motion between source and observer typically yields a Doppler shift, whereas no relative motion yields no Doppler effect.

SPHY001 Practice Quiz - Unit 18 | LA058

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

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SPHY001 Practice Quiz - Unit 18 | LA058

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

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.

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

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

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___.