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प्रश्न
What are fishing boats?
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उत्तर
These boats are provided with SONAR which stands for Sound Navigation and Ranging. The sound is the ultrasound which enables boatsmen to exactly pinpoint the location of fish in deep water. SONAR not only gives the distance but also the exact location of the prey.
संबंधित प्रश्न
Why are the ceilings of concert halls curved?
Define frequency term in relation to a wave.
A wave passes from one medium to another medium. Mention one property of the wave out of speed, frequency or wavelength which does not change.
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
Explain how is the principle of echo used by
(a) The bat during its flight at night,
(b) The dolphin to locate small fish as its prey.
(i) A man stands at a distance of 68 m from a cliff and fires a gun. After what time interval will he hear the echo, if the speed of sound in air is 340 ms−1?
(ii) If the man had been standing at a distance of 12 m from the cliff would he have heard a clear echo?
