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When a sound wave reflects from an obstacle back into the same medium, which of these properties stays unchanged?
APhase only
BDirection
CFrequency
DTotal path travelled
Answer & Solution
Correct answer: C. Frequency
1. On reflection into the same medium, speed and frequency of the wave do not change.
2. Wavelength also stays the same since $v$ and $n$ are unchanged.
3. Only the direction of travel reverses, so direction is not unchanged.
4. Therefore frequency remains unchanged.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 5 Acoustics "Acoustics", p.77_
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