A simple RC low-pass circuit is constructed using a 1-kΩ resistor and a 10-μF capacitor. This RC circuit is used to filter the output of a DUT containing a noisy DC signal. If the DUT's noise voltage has a constant spectral density of 100 nV/ Hz , what is the RMS noise voltage that appears at the output of the RC fi lter? If the we decrease the capacitor value to 2.2 μF, what is the RMS noise voltage at the RC fi lter output?