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The apparent change in the frequency of sound heard when there is relative motion between source and listener is called the
Aresonance effect
Becho effect
Creflection effect
DDoppler effect
Answer & Solution
Correct answer: D. Doppler effect
1. Relative motion between a source and listener changes the perceived frequency.
2. This phenomenon is the Doppler effect, named after Christian Doppler.
3. An echo is reflection of sound, a different phenomenon, so that option is wrong.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 5 Acoustics "Acoustics", p.72_
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