RC Time Constant Question

[Zman]

Hello-
I have an RC low-pass single order filter.
R = 40k
C = 10uF

The 3db point I'm filtering at is 1/2*pi*R*C = 0.4 Hz
The RC time constant is R*C = 0.4
Does this mean that there will be a 0.4 second delay between my input signal and output signal?

Thank you,

[Jerome Trent]

The delay that you are talking about would actually be the phase shift.  To find your phase shift use inverse tan XL/Xr.  That gives you 45 degrees, meaning that your output voltage lags by 45 degrees.  45 degrees would be 1/8 of a complete cycle.  A complete cycle takes .4 seconds, so your delay would be 1/8 times .4 seconds = .05 seconds or 50 milliseconds.