Advertisements
Advertisements
प्रश्न
How is it that bats are able to fly at night without colliding with other objects ?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Give two practical applications of reflection of sound waves.
Name the characteristic which helps us distinguish between a man's voice and a woman's voice, even without seeing them.
How is an ultrasound scan for fetus (unborn baby) better than X-ray ?
What is the name of the device which is used to find the depth of sea (or ocean) by using ultrasonic sound waves ?
Write the full name of 'SONAR'.
What name is given to sound waves of frequencies higher than 20 kHz ?
Explain why, if we strike a table lightly, we hear a soft sound but if we hit the table hard, a loud sound is heard.
Explain how, bats use ultrasound to catch the prey.
What is the range of frequencies associated with (a) infrasound (b) audible sound, and (c) ultrasound ?
What is sonar ? Explain its use.
