A half-wave dipole antenna in a PCS handset at 1.9 GHz, requires a signal strength of 0.01 micro volts per centimeter to operate with acceptable performance. The transmit antenna is assumed to be a half-wave dipole, has a cell radius of 5 km. Determine the power to be supplied to the transmit antenna whose efficiency is 90 percent, so that the cell phone may operate over the entire cell.