Marching soldiers are asked to break their steps while crossing a bridge. Why?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Concept of Resonance:**
- Resonance occurs when an external force or periodic motion matches the natural frequency of a system, leading to a significant increase in amplitude of oscillation.

2. **Identifying the Components:**
- In this scenario, the soldiers marching create a rhythmic force (their steps), and the bridge has a natural frequency at which it oscillates.

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