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प्रश्न
Explain why are soldiers asked to walk out of step while crossing bridges?
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उत्तर
When the soldiers walk in step, they produce some fixed frequency. If this frequency corresponds to the natural frequency of the bridge, the resonance can take place. This, in turn, will make the bridge to vibrate violently, and hence make it collapse. To avoid such a situation, the soldiers are asked not to march in step.
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.
Name the phenomenon involved in tuning your radio set to a particular station and define it.
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.
Differentiate between the following:
Free and forced vibrations.
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.
Explain Why are stringed musical instruments provided with large sound boxes?
What do you understand by free (or natural) vibrations?
What do you understand by forced vibrations?
What are the factors that affect the frequency of a vibrating string and how do they affect the frequency?
