Discussion
Assertion (A): Peak ground acceleration alone is an incomplete description of shaking.
Reason (R): Damage depends also on duration and frequency content.
Select the correct option.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the missing dimensions. Peak acceleration is a single ordinate from a single instant, and it says nothing about how long the shaking lasted or which frequencies carried the energy. Two records with the same peak can do very different damage, which is why a complete description needs amplitude, frequency content and duration together.
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