If the received power at a reference distance d0 = 1 km is equal to 1 microwatt, find the received powers at distances of 2 km, 5 km, 10 km, and 20 km from the same transmitter for the following path loss models:
a. Free space;
b. º = 3;
c. º = 4;
d. two-ray ground reflection using the exact and approximate expressions; and
e. Hata model for a large city environment