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In which situation is there NO Doppler effect, so the listener hears the original frequency?
ASource moving in towards a still listener fast
BListener moving in towards a still source fast
CSource and listener moving, keeping distance constant
DSource moving away from a still listener slowly
Answer & Solution
Correct answer: C. Source and listener moving, keeping distance constant
1. Recall when the Doppler effect occurs.
2. It needs the distance between source and listener to keep changing with time.
3. If they move so that the distance stays constant, there is no frequency change.
4. The other three options all involve a changing separation, producing a shift, so they are wrong.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 5 Acoustics "Acoustics", p.76_
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