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प्रश्न
Distinguish between the free (or natural) and forced vibrations.
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उत्तर
| Natural Vibration | Forced Vibration | |
| i. | An object's natural vibrations are its inherent vibrations, which occur at a consistent amplitude and frequency. |
Forced vibrations are those that occur as a result of being subjected to a periodic external force. |
| ii. | The amplitude changes with time. | Amplitude doesn't change throughout time. |
| iii. | The body's intrinsic frequency causes it to vibrate. | Does not move at its own natural frequency, but instead learns to deduce its own. |
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संबंधित प्रश्न
Name the phenomenon involved in tunning a radio set to a particular station.
What are forced 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.
When a body vibrates under a periodic force, the vibrations of the body are ______.
In fig. , P, Q, R and S represent test tubes each of height 20 cm which are filled with water upto heights of 10 cm, 14 cm, 16 cm and 18 cm respectively. If a vibrating tuning fork is placed over the mouth of test tube Q, a loud sound is heard.
(i) Describe the observations with the tubes P, R and S.
(ii) Give the reason for your observation in each case.
(iii) State the principle illustrated by the above experiment.
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).
State two ways in which resonance differs from forced vibrations.
Explain a person walking past a railway line, in the middle of night hears a ringing sound along with the sound of his footsteps.
Explain free and forced vibrations. Give an experimental arrangement to illustrate the phenomenon of resonance.
