Please help me, I'm so bewildered it's not even funny. Does the frequency only depend on the source? This all seems so paradoxical to me...for example: An 100 Hz oscillator produces a wave on a rope with a wavelength of .1 meters. If I increase the tension of the rope by sticking a weight at the end of it, the velocity increases. So does the wavelength, but the frequency stays he same. But...if I have a standing wave on a string and I increase the tension of the string, the frequency of the wave definitely increases. This frequency given as f=nv/2L (because the velocity increased the frequency does too). Is this all because in the first example the oscillator produces a constant frequency? If the oscillator had not been there, wouldn't the frequency increase? Also, if I take the first example and turn the oscillator to 200 Hz, wouldn't the wavelength drop correspondingly but the velocity of the wave would stay constant (velocity only determined by (Tension/linear mass density)^1/2.