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प्रश्न
When a tuning fork, struck by a rubber pad, is held over a length of the air column in a tube, it produces a loud sound for a fixed length of the air column. Name the above phenomenon. How does the frequency of the loud sound compare with that of the tuning fork? State the unit for measuring loudness.
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उत्तर
Resonance frequency of loud sound is either equal to or an integer multiple of the natural frequency of tuning fork. Decibel.
संबंधित प्रश्न
The adjacent diagram shows three different modes of vibrations P, Q and R of the same string.

(i) Which vibration will produce a louder sound and why?
(ii) The sound of which string will have maximum shrillness?
(iii) State the ratio of wavelengths of P and R.
Give one example to illustrate forced vibrations.
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.

When a body vibrates under a periodic force, the vibrations of the body are ______.
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.
On keeping the stem of a vibrating tuning fork on the surface of a table, a loud sound is heard. Give reason.
Explain why does the rear mirror of a motorbike start Vibrating Violently, at some particular speed of motorbike?
Explain a person walking past a railway line, in the middle of night hears a ringing sound along with the sound of his footsteps.
