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Assertion : The soldiers marching on a s...

Assertion : The soldiers marching on a suspended bridges are advised to go of steps
Reason : frequency of marching step may match we the nature frequency of oscillation of bridge

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If soldiers while crossing a bridge march in steps, the frequency of the marching steps of solders may match with natural frequency of oscillations of the suspended bridge. Resonance will take place in this situation, then amplitude of the oscillations of the bridge will increase enormously, which may cause the collapsing of bridge. So, to avoid this situation, marching troops are asked to break their steps while crossing the bridge.
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