College Physics 10th Edition by Raymond Serway,Chris Vuille

تمرين 24

A dish antenna with a diameter of 20.0 m receives (at normal incidence) a radio signal from a distant source, as shown in Figure P21.73. The radio signal is a continuous sinusoidal wave with amplitude E max = 0.20 µ V/m. Assume the antenna absorbs all the radiation that fallson the dish. (a) What is the amplitude of the magnetic field in this wave (b) What is the intensity of the radiation received by the antenna (c) What is the power received by the antenna