Thus the gain of the filter is:

				$$
				\left|H \right| = {\left|{1 \over {1+j\omega RC}} \right|}={\sqrt{1^2 + 0^2} \over \sqrt{ 1^2 + (\omega RC)^2}}
				\\
				={1 \over \sqrt{1+(\omega RC)^2}}
				$$