consider a system with a 0.1mw transmit power unit gain for the transmit and receive antennas operating at 50 mhz carrier frequency with a 100khz bandwidth.the system operates in a suburban environment. what is the receive snr at a 100m distance assuming a free space propagation? how does snr change when changing the carrier frequency to 500mhz and 5ghz?why does the 5ghz system show a significantly lower snr.assume the receiver noise figure is 5db independent of frequency