Question

Water waves coming into shore arrive every $4$ seconds. The waves at $2.0m/s$. How long are the waves?

• A. $4.0m$
• B. $8.0m$
• C. $2.0m$
• D. $0.50m$
• E. $16.0m$

Answer 1

The correct option is B $8.0m$

The frequency of the waves= Number of times they cross a point in a second=$\frac{1}{4}Hz=0.25Hz$

Hence from relation, $v=\lambda \nu$

$⟹\lambda =\frac{2m/s}{0.25Hz}=8m$