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.
To create a low pass filter with a frequency cutoff of 1000 Hz, we can use the following formula to determine our capacitor value based on the chosen resistance.
R=47
fc=1000
fc = 1/(2πRC)
fc = 1000 Hz
R=470
C=1/(2πRFc) = 1/(2π*1000*47047) = 0 3.39 3 μF
http://www.learningaboutelectronics.com/Articles/Low-pass-filter-calculator.php#answer1
R=1K
C=1/(2πRFc) = 1/(2π*1000*1000) = 0.159 μF
C=0.22 μF
R=1K
Fc=1/(2πRC) = 1/(2π*0.00000022*1000) = 723Hz
R=1/(2πFcC) = 1/(2π*1000*0.00000022 = 723 ohms
R=10k
C=1/(2πRFc) = 1/(2π*10000*1000) = 15.9 nF
R=47K
C=1/(2πRFc) = 1/(2π*1000*47000) = 3.39 nF