Q7. Determine the RMS noise voltage at the output 

Consider the inverting amplifier below. Assume the ONLY noise source is due to the op-amps input noise spectral density e_n = 5\text{nV}/\sqrt{\text{Hz}} (assume, except for this noise, the op-amp is ideal). That means the resistors 1\text{k}\Omega and 10\text{k}\Omega are NOISELESS. If the amplifier operates in the region 400Hz to 19kHz, what the RMS noise spectral density (in \text{nV}/\sqrt{\text{Hz}}) of the output.