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प्रश्न
What do you understand by free vibrations of a body? Draw a displacement-time graph to represent them. Given one example.
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उत्तर
The periodic vibrations of a body, of constant amplitude and constant frequency; are called free vibrations. The displacement-time graph to represent free vibrations of a body is given in the figure.
Example: A tuning fork vibrating in a vacuum.
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संबंधित प्रश्न
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.
How do you tune your radio set to a particular station ? Name the phenomenon involved in doing so and define it.
Differentiate between the following:
Radio waves and light waves.
The diagram below shows three different modes of vibration P, Q and R of the same string of a given length.
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| P | Q | R |
- Which vibration will produce a louder sound and why?
- Which vibration will produce sound of maximum shrillness (or pitch) and why?
- What is the ratio of wavelength of vibrations P and R?
A bucket kept under a running tap is getting filled with water. A person sitting at a distance is able to get an idea when the bucket is about to be filled.
(i) What change takes place in the sound to give this idea?
(ii) What causes the change in the sound?
What do you mean by resonance? When does resonance occur?
Explain why are soldiers asked to walk out of step while crossing bridges?
What do you understand by free (or natural) vibrations?
