Task: Text Categorization
Input (English): In a network, the steepness of the loss curve as a function of the log of this quantity is called "roll-off". The logarithm of this quantity is the independent variable in a Bode plot, which will display kinks at "cutoff" values of this quantity. For an LC circuit, "L times C, all to the minus one-half" is the circuit's "natural" value of this quantity. A critical value of this quantity that is equal to half a system's sampling rate gives the value above which aliasing occurs, and is named for Nyquist. For an ideal mass on a spring, the square root of the ratio of the spring constant and the mass is another "natural" value of this quantity, whose namesake domain is related by the Fourier transform to the time domain. For 10 points, name this quantity that equals the velocity of a wave divided by its wavelength, and whose SI unit is the hertz.
Output (English): Science