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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
Name the characteristic of sound in relation to its waveform.
Define frequency term in relation to a wave.
Explain how the principle of echo is used by
The dolphin to locate small fish as its prey
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.
What do you mean by reflection of sound? State one condition for the reflection of a sound wave. Name a device in which reflection of sound wave is used.
Name the type of waves that are used for sound ranging. Why are radio waves not audible to us?
When a sound is made from a distance of 18 m, in front of a tall building, it is found to get repeated again. Which phenomenon is associated with this observation? Give a brief explanation of this phenomenon?
Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?
Explain Reflection at curved surfaces.
