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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.
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
What are forced vibrations?
Distinguish between the free (or natural) and forced vibrations.
Why is a loud sound heard at resonance?
In following figure shows A, B, C and D are four pendulums suspended from the same elastic string XY. Lengths of pendulum A and D are equal, while the length of pendulum B is smaller and the pendulum C is longer. The pendulum A is set into vibration.
(a) what is your observation? (b) Give reason for your observation.
A vibrating tuning fork, held over an air column of a given length with its one end closed, produces a loud audible sound. Name the phenomenon responsible for it and explain the observation.
In fig. shows two tuning forks P and Q of the same frequency mounted on separate sound boxes with their open ends facing each other. The fork A is set into vibration. (i) Describe your observation. (ii) State the principle illustrated by this experiment.
On keeping the stem of a vibrating tuning fork on the surface of a table, a loud sound is heard. Give reason.
What do you mean by resonance? When does resonance occur?
When acoustic resonance takes place, a loud sound is heard. Why does this happen? Explain.
Explain why stringed musical instruments, like the guitar, are provided with a hollow box.
