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प्रश्न
How do bats avoid obstacles in their way, when in flight?
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उत्तर
Bats can produce and detect the sound of very high frequency up to about 1000kHz. The sounds produced by flying bats get reflected back from any obstacle in front of it. By hearing the echoes, bats come to know even in the dark where the obstacles are. So they can fly safely without colliding with the obstacles.
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
State the use of echo by a bat, dolphin and fisherman.
Name the principle on which a soundboard works.
What is a bulb horn ? Name the principle on which a bulb horn works.
What is a soundboard ? Explain the working of a soundboard with the help of a labelled diagram.
Explain how the principle of echo is used by
The bat during its flight at
Write the approximate value of the speed of sound in water.
Write the approximate value of the speed of sound in iron.
Mention two properties of a wave, one property which varies and the other which remains constant when the wave passes from one medium to another.
Match the following:
| 1. | Stethoscope | a. | Repeated reflections |
| 2. | Echogram | b. | Multiple reflections |
| 3. | SONAR | c. | Ultrasonic waves |
| 4. | Reverberation | d. | Speed of underwater objects |
