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प्रश्न
What type of waves are generated by SONAR device fixed to a fishing ship ?
विकल्प
water waves
radio waves
sound waves
infrared waves
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उत्तर
SONAR uses ultrasonic sound waves.
(c) Sound waves.
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संबंधित प्रश्न
Give two practical applications of reflection of sound waves.
Explain how bats use ultrasound to catch a prey.
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Define the 'frequency' and 'time-period' of a wave. What is the relation between the two?
Fill in the blank with suitable word :
Loudness of sound depends on .....................
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Explain how, bats use ultrasound to catch the prey.
Write any three applications (or uses) of ultrasound.
Define the following terms : (a) Echolocation (b) Echocardiography, and (c) Ultrasonography.
Which of the two produces ultrasonic waves : porpoise or whale ?
