Final answer:
The noun clause 'the building's height matches the condition for setting up a standing wave' completes the sentence. This clause explains that buildings could collapse during an earthquake if their height resonates with the earthquake's frequency, emphasizing the need for adequate preparedness.
Step-by-step explanation:
In the given sentence, we could provide a noun clause related to the topic of earthquakes. One of the possible completions could be: 'Whether or not the building's height matches the condition for setting up a standing wave, we must always be prepared for earthquakes.' This sentence refers to the phenomenon where buildings of a certain height are devastated during earthquakes while others remain intact. This is due to the resonance that occurs when the driving frequency of the earthquake matches the natural frequency of the building. Such conditions can lead to destructive interference, which stands as a reminder that we must always be prepared for earthquakes.
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