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प्रश्न
What do you understand by free (or natural) vibrations?
Explain natural vibrations.
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उत्तर
Any object when slightly disturbed from its position of rest or equilibrium vibrates with its own period irrespective of its size or shape, is said to make vibrations. The time period of said vibrations is called the natural time period and the frequency is called the natural frequency. In the absence of any resistance such as air, the amplitude of free vibration remains constant.
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संबंधित प्रश्न
Give one example to illustrate forced vibrations.
Differentiate between the forced and resonant vibrations.
In following figure shows A, B , C and D represent test tube each of height 20 cm which are filled with water up to heights of 12 cm, 14 cm, 16cm and 18cm respectively. If a vibrating tuning fork is placed over the mouth if test tube D, a loud sound is heard.
- Describe the observations with the tubes A, B and C when the vibrating tuning fork is placed over the mouth of these tubes.
- Give the reason for your observation in each case.
- State the principle illustrated by the above experiment.
How do you tune your radio set to a particular station ? Name the phenomenon involved in doing so and define it.
In Fig. A, B, C and D are four pendulums suspended from the same elastic string XY. The lengths of pendulum A and D are equal, while the length of pendulum B is shorter and of the pendulum C is longer. Pendulum A is set into vibrations.
- What is your observation about the vibrations of pendulum D?
- Give reason for your observation in part (a).
- What type of vibrations take place in pendulums Band C?
- Give reason for the answer in part (c).
Differentiate between the following:
Light and sound 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?
What are the factors that affect the frequency of a vibrating string and how do they affect the frequency?
What do you understand by free vibrations of a body? Draw a displacement-time graph to represent them. Given one example.
