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प्रश्न
Explain how the principle of echo is used by
The dolphin to locate small fish as its prey
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उत्तर
Dolphins detect their enemies and small fishes by emitting ultrasonic waves in all directions and then hearing their reflected sound i.e. echo. Dolphins can judge the nature of obstacles or of small fish by hearing the echo and catch their prey.
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संबंधित प्रश्न
Name the characteristic of sound in relation to its waveform
State two differences between the light and sound waves.
What is the condition necessary for an echo to be heard distinctly?
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
What are mechanical waves?
What do you understand by the ‘Echolocation system of Dolphins’?
Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?
Draw a diagram representing a wave of amplitude 4 cm and wavelength 2 m. If the frequency of the wave is 150 Hz, calculate its velocity.
(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?
