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C=1/(2πRFc) = 1/(2π*1000*470) = 0.39 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
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