[单选题]
Water drips onto a pondp0k-se8 gm f9 r5epbe0 every 3.0 seconds.fp ,kp./abpsu, p u7k: The speed of water waves in the pond has been mkpp/apfkpu:,7. us ,beasured to be $1.2\,ms^{−1}$. What is the wavelength of water waves generated because of the drops?