Advertisements
Advertisements
प्रश्न
Give two differences between music and noise.
Advertisements
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
The bees do not have voice-boxes. How do they produce sound ?
You recognize your friend by hearing his voice on a telephone. Explain.
What are longitudinal waves and transverse waves? Explain with the help of labelled diagrams.
Give two examples each of longitudinal waves and transverse waves.
What causes sound?
Explain meaning of the terms compression and rarefaction in relation to a longitudinal wave.
Sound is generated by the rhythmic ______ of an object.
How is the sound produced?
Select the correct option:
If the frequency of a wave is 25 Hz. the total number of compressions and rarefactions passing through a point in 1 second is :
A continuous disturbance is created on the surface of water in a ripple tank with a small piece of cork floating on it. Describe the motion of the cork. What does the motion of the cork tell about the disturbance?
Can you hear each other in a dark room?
What is the effect of temperature and pressure on the speed of sound in a gas?
The smoke from the gun barrel is seen 2 second before the explosion is heard. If the speed of sound in air is 350 ms-1, calculate the distance of observer from the gun.
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 |
A musical instrument is producing continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through ______.
Why does an empty vessel produce more sound than a filled one?
Unwanted sounds are called ______.
In which medium the speed of the sound is maximum?
Name the waves used for sound ranging. State one reason for their use.
