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प्रश्न
How does a bat make use of ultrasonics waves to find its way?
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उत्तर
Use of ultrasonics by bats : Bats have no eyes. But they easily move about without colliding with any object (or obstacle). The reason is that they produce ultrasonic sound as they fly. When this ultrasonic sound comes back after reflection from any object (or obstacle) in their way, they hear it and thus they detect the presence of the object (or obstacle).
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संबंधित प्रश्न
What is a longitudinal wave ?
What are infrasonics? Can you hear them?
Distinguish between longitudinal and transverse waves.
We can distinguish between the musical sounds produced by different singers on the basis of the characteristic of sound called :
Is pitch same as frequency?
Match the pairs.
| Group ‘A’ | Group ‘B’ |
| (a) Flute | (1) Frequency less than 20 Hz |
| (b) Frequency | (2) Frequency more than 20000 Hz |
| (c) Sound level | (3) Vibrations in the air |
| (d) Ultrasonic sound | (4) Measured in Hz |
| (e) Infrasonic sound | (5) Decibel |
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A sound wave travels 2000 m in 8 s. What is the velocity of the sound?
Mention two cases in which there is no Doppler effect in sound?
What are the uses of infrasonic sound?
