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प्रश्न
When a troop crosses a suspension bridge, the soldiers are asked to break steps. Explain the reason.
When a troop crosses a suspension bridge, the soldiers are asked to break their steps. Why?
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उत्तर
When a troop crosses a suspension bridge, the soldiers are asked to break steps. The reason is that when soldiers march in steps, all the separate periodic forces exerted by them are in same phase and therefore forced vibrations of a particular frequency are produced in the bridge. Now, if the natural frequency of the bridge happens to be equal to the frequency of the steps, the bridge will vibrate with large amplitude due to resonance and suspension bridge could crumble.
संबंधित प्रश्न
When a body vibrates under a periodic force, the vibrations of the body are ______.
Differentiate between the following:
Light and sound waves.
Differentiate between the following:
Free and forced vibrations.
State two ways in which resonance differs from forced vibrations.
The rearview mirror of a motorbike starts vibrating violently at some particular speed of the motorbike. What is the name of the phenomenon taking place? Why does the happen?
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.
A vibrating tuning fork is placed over the mouth of a burette filled with water. The tap is opened and the water level gradually falls. It is observed that the sound becomes the loudest for a particular length of the air column. What is the name of the phenomenon taking place when this happens? Why does the sound become the loudest?
What do you understand by free (or natural) vibrations?
What do you understand by free vibrations of a body? Draw a displacement-time graph to represent them. Given one example.
