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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
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.
How do you tune your radio set to a particular station ? Name the phenomenon involved in doing so and define it.
Differentiate between the following:
Free and forced vibrations.
Give two examples of forced vibrations.
State two ways in which resonance differs from forced vibrations.
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.
What do you understand by forced vibrations?
