A motor boat oscillates in the water and generates water waves with frequency $0.20\,\text{Hz}$. These waves travel through the water at $20\,\text{m s}^{-1}$. The motor boat is moving at $5.0\,\text{m s}^{-1}$ straight towards a sailing boat that is stationary. The Doppler effect equation for sound waves is also valid for water waves. What frequency do the waves arrive at the stationary sailing boat with?
- A$0.15\,\text{Hz}$
- B$0.16\,\text{Hz}$
- C$0.25\,\text{Hz}$
- D$0.27\,\text{Hz}$