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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
The displacement distance graph of two sound waves A and B, travelling in a medium, are as shown in the diagram below.
Study the two sound waves and compare their:
- Amplitudes
- Wavelengths
Define wave velocity term in relation to a wave.
Name the waves which are used in sonar to find the depth of a sea. Give one reason for their use.
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
Explain how the principle of echo is used by the bat during its flight at night.
Write the approximate value of the speed of sound in water.
State two factors on which the natural frequency of a body depends.
Waves produced on the surface of the water are formed to move with a velocity of 24 ms−1. If the wavelength of these waves equals 20 cm. find the
(i) frequency (no. of waves produced per second)
(ii) the time period (i.e. the time required to produce one wave) for these waves.
