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What exactly does the frequency of a wave count?
AMetres between two nearby crests
BCrests passing a point each second
CSeconds between two nearby crests
DMetres a crest moves each second
Answer & Solution
Correct answer: B. Crests passing a point each second
1. Stand at one place beside a pond and start a stopwatch as a crest goes past.
2. Count the crests that pass you in one second, and that count is the frequency.
3. The frequency is measured in hertz, which means events per second.
4. The time between two successive crests is the period, and the gap in metres between them is the wavelength.
_Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 8: Transverse waves_