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Sound Waves — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsSound Waves2 Marks
Question
In discussing Doppler effect, we use the word "apparent frequency". Does it mean that the frequency of the sound is still that of the source and it is some physiological phenomenon in the listener's ear that gives rise to Doppler effect? Think for the observer approaching the source and for the source approaching the observer.
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Answer

In both cases if observer approaches source or source approaches observer the apparent frequency is physiological phenomenon as the frequency of the sound is still the same but due to motion w.r.t. each other the apparent frequency changes.

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