1.30 The power spectral density of a narrowband noise n(t) is as shown in Figure P1.30. Thecarrier frequency is 5 Hz.(a) Find the power spectral densities of the in-phase and quadrature components of n(t).(b) Find their cross-spectral densities.1.31 Consider a Gaussian noise n(t) with zero mean and the power spectral density SN(f)shown in Figure P1.31.(a) Find the probability density function of the envelope of n(t).(b) What are the mean and variance of this envelope?