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प्रश्न
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उत्तर
Sounds can be roughly divided into two categories: (i) music, and (ii) noise.
Regularity, contrivity and rapidity make musical sounds different from a noise. The distinction between music and noise is not very sharp; it is subjective.
| 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 chanqes 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). |
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संबंधित प्रश्न
In following figure shows A, B, C and D are four pendulums suspended from the same elastic string XY. Lengths of pendulum A and D are equal, while the length of pendulum B is smaller and the pendulum C is longer. The pendulum A is set into vibration.
(a) what is your observation? (b) Give reason for your observation.
A vibrating tuning fork, held over an air column of a given length with its one end closed, produces a loud audible sound. Name the phenomenon responsible for it and explain the observation.
When a troop crosses a suspension bridge, the soldiers are asked to break steps. Explain the reason.
How do you tune your radio set to a particular station ? Name the phenomenon involved in doing so and define it.
State two ways in which resonance differs from forced vibrations.
The rearview mirror of a motorbike starts vibrating violently at some particular speed of the motorbike. What is the name of the phenomenon taking place? Why does the happen?
A vibrating tuning fork is placed over the mouth of a burette filled with water. The tap is opened and the water level gradually falls. It is observed that the sound becomes the loudest for a particular length of the air column. What is the name of the phenomenon taking place when this happens? Why does the sound become the loudest?
Explain Why are stringed musical instruments provided with large sound boxes?
What do you understand by free (or natural) vibrations?
Describe a simple experiment to illustrate the phenomenon of resonance and explain it.
