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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
Write the full name of 'SONAR'.
What happens to the pitch of a sound if its frequency increases ?
What name is given to sound waves of frequencies higher than 20 kHz ?
Draw labelled diagrams to represent (a) soft sound, and (b) loud sound, of the same frequency.
Draw labelled diagrams to represent sound of (a) low pitch, and (b) high pitch, of the same loudness.
What is meant by the quality (or timbre) of sound ? On what factor does the quality (or timbre) of a sound depend ?
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, flaws (or defects) in a metal block can be detected by using ultrasound.
Write any three applications (or uses) of ultrasound.
A sonar station picks up a return signal after 3 seconds. How far away is the object ? (Speed of sound in water = 1440 m/s).
