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

Question

BlackTom AI · Accepted Answer

Understanding the scenario: the question asks about how perceived frequency changes when the source is moving toward the observer, which is a classic Doppler effect situation.
Option 1: 'The frequency remains unchanged.' This would be true if either the source or observer were stationary relative to the medium, or if there were no relative motion; however, relative motion toward the observer typically changes the observed frequency, so this statement is incorrect for a moving source toward you.
Option 2: 'The frequency will become lower.' A moving source toward the observer does not produce a lower frequency; a closer approach generally increases the observed frequency. This option misattributes the effect of relative motion and is therefore incorrect.
Option 3: 'The frequency will become higher.' This aligns with the Doppler effect for a source moving toward the observer: the waves are compressed, reducing the wavelength and raising the frequency heard by the observer. This is the correct interpretation of the phenomenon.
Option 4: 'The frequency could become higher or lower depending on temperature.' Temperature effects can influence the speed of sound in air, but the relative motion toward the observer still causes a higher frequency regardless of temperature; the statement introducing temperature as a determinant of higher or lower frequency is misleading in the standard Doppler context and thus incorrect.

SPHY001 Practice Quiz - Unit 18 | LA058

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

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SPHY001 Practice Quiz - Unit 18 | LA058

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

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

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

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___.