1. The problem statement, all variables and given/known data What is the wavelength of a 25 Hz sound wave? What is the wavelength of a 4.5 kHz sound wave? 2. Relevant equations wavelength = velocity / frequency or λ = v/f 3. The attempt at a solution I know that I'm supposed to plug the 25 into the equation, but he didn't give us a velocity, so now I'm stuck. That's what I need help with. :/ The speed of sound is 340 m/s is that what I'm supposed to use for velocity?