Advertisements
Advertisements
प्रश्न
Explain how the principle of echo is used by
The dolphin to locate small fish as its prey
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.
APPEARS IN
संबंधित प्रश्न
Name the principle on which a soundboard works.
What is the shape of a soundboard kept behind the speaker on the stage of a big hall ?
What is a soundboard ? Explain the working of a soundboard with the help of a labelled diagram.
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
How are bats able to fly in the dark?
What do you understand by the ‘Echolocation system of Dolphins’?
(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?
Explain reflection at the boundary of a rarer medium.
