Question

An observer standing near the sea-coast counts $48$ waves per min. If the wavelength of the wave is $10\,m,$ the velocity of the waves will be

• A. 8 m/s
• B. 12 m/s
• C. 16 m/s
• D. 20 m/s

Answer 1

Answer: (A)

8 m/s

Answer 2

According to the question, Frequency,
$v=\frac{48}{60} Hz =\frac{4}{5}=0.8\, Hz$
Wavelength, $\lambda=10\, m$
$\therefore$ Wave velocity, $v=v \lambda=(0.8)(10)$
$=8\, m / s$