Hello everyone! I'm having troubles understanding why i'm not getting this right...the problem is: A sinusoidal wave is traveling on a string with speed 10. cm/s. The displacement of the particles of the string at x = 25 cm is found to vary with time according to the equation y = (5.0 cm) sin[10.0 - (4.0 s-1)t]. The linear density of the string is 3.0 g/cm. What is the frequency of the wave? Well wouldn't just be 4.0 s^-1? Also it says What is the wavelength of the wave? I t hought it would be: You know the wave number is: (5.0 cm) and you know the relationship: Wave Length = 2PI/k, where k is the wave number: so i put: Wave Length = 2PI/5 = 1.2566 which was wrong any ideas why i'm not getting these right? THanks!