You have a series circuit consisting of a ac power supply, a 1150.0 ohm resistor and a 144.0 nF capacitor. If the circuit is configured as a low pass filter, what frequency will cause the gain to be 0.25? Formula Gain = Vout / Vin = R / [R^2 + (1/ωC)^2]^1/2 Solution Plugging in R=1150 ohms C=144*10^-9 F to find a value for ω And then using ω=2 π f I got f= 0.05223Hz which is wrong. Also what will be the formula for high pass filter? Please help!