The low pass filter only allows low frequency signals from 0Hz to its cut-off frequency, ƒc point to pass while blocking those any higher.
fc = 1/(2πRC)
So, if
...
fc = 1000 Hz
R=470
C=1/(2πRFc) = 1/(2π*1000*470) = 0.39 μF
R=1K
C=1/(2πRFc) = 1/(2π*1000*1000) = 0.159 μF
R=10k
C=1/(2πRFc) = 1/(
...
2π*10000*1000) = 15.9 nF
...
R=47K
C=1/(2πRFc) = 1/(2π*1000*47000) = 3.39 nF