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प्रश्न
Explain how, bats use ultrasound to catch the prey.
उत्तर
Bats emit ultrasonic squeaks while flying and listen to the echoes produced by the reflection of their squeaks from their prey. From the time taken by the echo to be heard, bats can judge the distance of the prey in their path and catch them.
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संबंधित प्रश्न
Give two practical applications of reflection of sound waves.
Define the 'frequency' and 'time-period' of a wave. What is the relation between the two?
Name the three characteristics of sound.
Name the unit used to measure the loudness of sound. Also write its symbol.
Name the characteristic which helps us distinguish between a man's voice and a woman's voice, even without seeing them.
Name the characteristic of sound which can distinguish between the 'notes' (musical sounds) played on a flute and a sitar (both the notes having the same pitch and loudness).
Fill in the blank with suitable word :
Loudness of sound depends on .....................
Fill in the blank with suitable word :
Quality 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 ?
