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प्रश्न
Fill in the blank with suitable word .
Sound waves are caused by ...................
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उत्तर
Sound waves are caused by Vibrations.
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संबंधित प्रश्न
Explain how bats use ultrasound to catch a prey.
How is ultrasound used for cleaning?
Name the unit used to measure the loudness of sound. Also write its symbol.
Name the characteristic of sound which depends on (a) amplitude (b) frequency, and (c) waveform.
What type of scans are used these days to monitor the growth of developing baby in the uterus of the mother ?
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 ?
What happens to the loudness of a sound if its amplitude decreases ?
Explain how, bats use ultrasound to catch the prey.
Which of the two produces ultrasonic waves : porpoise or whale ?
