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प्रश्न
How is it that bats are able to fly at night without colliding with other objects ?
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उत्तर
Bats are able to fly at night without colliding with other objects because they emit ultrasonic squeaks and listen to the echoes produced by the reflection of their squeaks from the objects or obstacles in their path. Bats can judge the distance of the object in their path and avoid it by changing the direction using the time taken by the echo to be heard after reflection from the obstacle.
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संबंधित प्रश्न
Define the 'frequency' and 'time-period' of a wave. What is the relation between the two?
Fill in the blank with suitable word .
Sound waves are caused by ...................
Name the characteristic of sound which depends on (a) amplitude (b) frequency, and (c) waveform.
Write the full name of 'SONAR'.
What name is given to sound waves of frequencies higher than 20 kHz ?
Fill in the blank with suitable word :
Loudness of sound depends on .....................
Draw labelled diagrams to represent (a) soft sound, and (b) loud sound, of the same frequency.
Which of the two produces ultrasonic waves : porpoise or whale ?
What is sonar ? Explain its use.
What type of waves are generated by SONAR device fixed to a fishing ship ?
