Discussion
Assertion (A): Swell arriving at a coast shows a period that decreases over time.
Reason (R): Longer waves travel faster and therefore arrive from a distant storm first.
Answer: D
Both are true and the reason gives the dispersive sorting, and this allows the distance to the generating storm to be estimated. The rate at which the period falls gives the travel time directly. Swell period is a record of how far the waves have travelled.
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