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As a result of a distant explosion, an o...

As a result of a distant explosion, an observer first senses a ground tremour, then hears the explosion. What accounts for this time lag?

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### Step-by-Step Solution: 1. **Understanding the Scenario**: - An explosion occurs at a distance, and the observer experiences two sensations: a ground tremor followed by the sound of the explosion. 2. **Identifying the Two Types of Waves**: - The explosion generates sound waves that travel through two mediums: the ground (solid) and the air (gas). ...
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