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प्रश्न
What are forced vibrations?
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उत्तर
The vibrations of a body which take place under the influence of an external periodic force acting on it, are called the forced vibrations.
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संबंधित प्रश्न
Give one example to illustrate forced vibrations.
Why is a loud sound heard at resonance?
Why are the stringed instruments like guitar provided with a hollow sound box?
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).
Give two examples of forced vibrations.
When acoustic resonance takes place, a loud sound is heard. Why does this happen? Explain.
Explain why are soldiers asked to walk out of step while crossing bridges?
Explain why does the rear mirror of a motorbike start Vibrating Violently, at some particular speed of motorbike?
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.
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?
