1. The problem statement, all variables and given/known data ''A machineoutputs a 4kHz sine wave signal of amplitude 2 volts peak, plus a 100Hz interference component of amplitude 1 V peak'' Given equation: Vout/Vin = 1/((1+(f0/f^2))^0.5 phase lead = inverse tan (f0/f) f0 = 1/(2*pi*R*C) I'm given a 4 kilo-ohm resistor and need to choose a capacitor to reduce the interference (100 Hz signal) to 0.05 V peak; I need to design a high pass RC circuit. 2. Relevant equations given in the Q 3. The attempt at a solution I'm not sure what f0 and f actually is. Equations I can find which are similar to this have 'critical frequencies' mentioned.