The gain of the RC low pass filter having time constant ‘τ' and frequency ‘ω' is:
1
\(\sqrt {1 + {{\left( {\omega \tau } \right)}^2}}\)
2
\(\frac{1}{{\sqrt {1 + {{\left( {\omega \tau } \right)}^2}} }}\)
3
\(\frac{{{\rm{\omega \tau }}}}{{\sqrt {1 + {{\left( {\omega \tau } \right)}^2}} }}\)
4
\(\frac{{\omega \tau }}{{\sqrt {1 - {{\left( {\omega \tau } \right)}^2}} }}\)