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प्रश्न
Sound is generated by the rhythmic ______ of an object.
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उत्तर
Sound is generated by the rhythmic vibration of an object
संबंधित प्रश्न
Why are sound waves called mechanical waves?
Write true or false for a given statement.
A ticking clock sound is heard late when heard through a metal.
| Column A | Column B |
| (a) Vibrations cause | (1) absorb sound |
| (b) A shriller sound is | (2) second |
| (c) Unit of frequency | (3) sound |
| (d) Unit of time period | (4) of high pitch |
| (e) Curtains | (5) hertz |
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.
Arrange the speed of sound in gases Vg, solids Vs and liquids VLin an ascending order.
Answer the following question :
Can sound travel in vacuum?
Select the correct option:
A longitudinal wave consists of:
A thin metal plate is placed against the teeth of cog wheel. Cog wheel is rotated at a speed of 120 rotations per minute and has 160 teeth. Calculate:
- frequency of node produced.
- speed of sound, if wavelength is 1.05 m.
- what will be the effect when the speed of cog wheel is doubled?
Match the following
| 1. | Infrasonic | (a) | Compressions |
| 2. | Echo | (b) | 22 kHz |
| 3. | Ultrasonic | (c) | 10 Hz |
| 4. | High-pressure region | (d) | Ultrasonography |
