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प्रश्न
Give two differences between music and noise.
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उत्तर १
| Music | Noise |
| 1. It is pleasant, smooth and agreeable to the ear. | 1. It is harsh, discordant and displeasing to the ear. |
| 2. It is produced by the vibrations which are periodic.. | 2. It is produced by an irregular succession of disturbances. |
| 3. All the component waves are similar without any sudden change in their wavelength and amplitude. | 3. The component wave changes their character suddenly and they are of short duration.. |
| 4. The sound level is low (below 30 dB). | 4. The sound level is hiah (above 120 dB). |
उत्तर २
- Music:
- The sound provides a pleasing sensation to the ear.
- It is produced by the regular patterns of vibrations.
-
Noise:
- Sound that is unpleasant to the ear
- It is produced by irregular and non-periodic vibrations.
संबंधित प्रश्न
Fill in the blank.
The pitch of a sound depends on its ________.
What is sound ?
What are infrasonics? Can you hear them?
On what factor does the loudness of a sound depend ?
Draw a graph between displacement from mean position and time for a body executing free vibrations in vacuum.
State the general name of the waves in which the particles of the medium vibrate :
(i) in the same direction as wave.
(ii) at right angles to the direction of wave.
Give two examples each of longitudinal waves and transverse waves.
Arrange the speeds of sound in gases, solids, and liquids in ascending order.
Can we produce sound in vacuum?
A person fires a gun and other boy at a distance hears the sound of the fire 2.5 s after seeing the flash. If the speed of sound in air is 330 ms-1, find the distance between the boys.
The sound of which of the following frequency is audible to us?
2 Hz, 1000 Hz, 200 kHz, 8 MHz
Sound waves travel very fast in
How does the sound produced by a vibrating object in a medium reach your ears?
Describe with diagram, how compressions and rarefactions are produced.
Match the following
| 1. | Infrasonic | (a) | Compressions |
| 2. | Echo | (b) | 22 kHz |
| 3. | Ultrasonic | (c) | 10 Hz |
| 4. | High-pressure region | (d) | Ultrasonography |
Name three animals which can hear ultrasonic vibrations.
The speed of sound in air at 0°C is ______.
Assertion: The sound of thunder is heard a little later than the flash of light.
Reason: The speed of sound is much less than the speed of light.
