A boat at anchor is rocked by waves whose crests are $100\, m$ apart and velocity is $25\, m/sec$. The boat bounces up once in every: ... $sec$
AIIMS 2006, Medium
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Wavelength is distance between two crest.
$\lambda=100 \mathrm{m} ; \quad \mathrm{v}=25$
$\mathrm{n}=\frac{25}{100}$
$\mathrm{T}=\frac{1}{\mathrm{n}}=\frac{100}{25}=4 \mathrm{sec}$
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