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प्रश्न
(i) Define resonant vibrations.
(ii) Which characteristic of sound, makes it possible to recognize a person by his voice without seeing him?
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उत्तर
(i) When the natural frequency of vibration becomes equal to the frequency with which the object is vibrating, the object will have maximum amplitude. This is called resonant vibration.
(ii) Timber or quality of sound.
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संबंधित प्रश्न
Name the phenomenon involved in tunning a radio set to a particular station
What are mechanical waves?
The diagram above shows a wire stretched over a sonometer. Stems of two vibrating tuning forks A and Bare touched to the wooden box of the sonometer. It is observed that the paper rider (a small piece of paper folded at the centre) present on the wire flies off when the stem of vibrating tuning fork B is touched to the wooden box but the paper just vibrates when the stem of vibrating tuning fork A is touched to the wooden box.
1) Name the phenomenon when the paper rider just vibrates.
2) Name the phenomenon when the paper rider flies off.
3) Why does the paper rider fly off when the stem of tuning fork B is touched to the box?
Why is a loud sound heard at resonance?
In following figure shows two tuning forks A and B of the same frequency mounted on two separate sound boxes with their open ends facing each other. The fork A is set into vibration.
- Describe your observation.
- State the principle illustrated by this experiment.
Differentiate between the following:
Radio waves and light waves.
Explain a tuning fork (vibrating) is held close to ear. One hears a faint sound. The same vibrating tuning fork is placed on table, such that its handle is in contact with table, one hears a loud sound.
What do you understand by free vibrations of a body? Draw a displacement-time graph to represent them. Given one example.
Explain free and forced vibrations. Give an experimental arrangement to illustrate the phenomenon of resonance.
