$9)($a$)$ Define effective isotropic radiated power.

$[3][$COO$4][$BTL $1]$

$($b$)$ In a two$-$way communication setup, the transmitter transmits an output power of $100$ W at $10$ GHz $.$ The transmitting antenna has a gain of $36$ dB $,$ and receiving antenna has a gain of $30$ dB $.$ What is the received power level at distance $40$ Km i$)$ If there is no system loss and

ii$)$ if the system loss is $10$ dB $?$

$[7][$CO$04][$BTL $3]$