Question

A kitchen sink is filled with water. A dripping kitchen faucet creates circular water waves along the water’s surface which travel at a speed of 0.042 m/s and have a wavelength of 0.05 m. How many drips strike the water’s surface in 12 s?

Answer 1

$\lambda=\frac{v}{\nu}\to \ \nu=\frac{v}{\lambda}=\frac{0.042}{0.05}=0.84(Hz)$

$n=0.84\cdot12\approx10$ . Answer