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In SONAR, the speed of submarines and marine animals is found by measuring the change in which quantity between the sent and received signals?
AMass of the target
BWavelength only
CAmplitude only
DFrequency
Answer & Solution
Correct answer: D. Frequency
1. SONAR sends a signal and detects the wave reflected by a moving target.
2. Relative motion shifts the frequency of the reflected wave (Doppler effect).
3. From this frequency change the target's speed is calculated.
4. Amplitude and mass are not used for the speed measurement.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 5 Acoustics "Acoustics", p.76_
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