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प्रश्न
What is sound? How is it produced?
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उत्तर
Sound is a form of energy that produces the sensation of hearing in our ears. Sound is produced by a vibrating body.
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संबंधित प्रश्न
Write true or false for a given statement.
Loudness depends on frequency.
How does the loudness of sound produced depend on the vibrating area of the body ?
Which wave property determines pitch?
Explain the terms 'crests' and troughs' of a wave? What type of waves consist of crests and troughs?
In fig. 2 two musical notes of the same pitch and same loudness are played on a violin and on a piano. Their wave forms are as shown in the diagram below. Explain why the wave patterns are different.
The heart of a man beats 75 times a minute. What is its (a) frequency and (b) time period?
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Match the pairs.
| Group ‘A’ | Group ‘B’ |
| (a) Flute | (1) Frequency less than 20 Hz |
| (b) Frequency | (2) Frequency more than 20000 Hz |
| (c) Sound level | (3) Vibrations in the air |
| (d) Ultrasonic sound | (4) Measured in Hz |
| (e) Infrasonic sound | (5) Decibel |
Can you hear the sound produced due to the vibrations of second's pendulum?
Explain how the principle of echo is used by
The bat during its flight at night
