Physics

The key is recognizing that wave speed, frequency, and wavelength are linked by $v = f\lambda$. First, find how fast the wave travels by dividing distance by time—that's your speed. Then figure out the frequency by counting how many complete cycles pass the fixed point per second. Once you have both $v$ and $f$, you can rearrange the wave equation to solve for $\lambda$.

The key is recognizing that wave speed, frequency, and wavelength are linked by $v = f\lambda$. First, find how fast the wave travels by dividing distance by time—that's your speed. Then figure out the frequency by counting how many complete cycles pass the fixed point per second. Once you have both $v$ and $f$, you can rearrange the wave equation to solve for $\lambda$.