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प्रश्न
Give two differences between music and noise.
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.
We can hear sounds of frequency in the range of _______
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The separation between two consecutive crests in a transverse wave is 100 m. If wave velocity is 20 m s-1, find the frequency of wave.
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The speed of sound is more in hydrogen than in nitrogen. Is this statement true? Give a reason for your answer.
What do you mean by the frequency of sound?
What is the SI unit of frequency?
Match the following.
| Ultrasonics | Frequency below 20Hz |
| Speed of sound in air | Needs material medium |
| Infrasonics | 330ms-1 |
| Sound propagation | Frequency more than 20000 Hz |
Sound travels in air:
Sound is a ______ wave and needs a material medium to travel.
Match the following
| 1. | Infrasonic | (a) | Compressions |
| 2. | Echo | (b) | 22 kHz |
| 3. | Ultrasonic | (c) | 10 Hz |
| 4. | High-pressure region | (d) | Ultrasonography |
Sound cannot travel through ______.
What is a wave?
