College Physics 10th Edition by Raymond Serway,Chris Vuille

تمرين 84

In radio transmission a radio wave serves as a carrier wave, and the sound signal is superimposed on the carrier wave. In amplitude modulation (AM) radio, the amplitude of the carrier wave varies according to the sound wave. The U.S. Navy sometimes uses flashing lights to send Morse code between neighboring ships, Figure cQ21.1 a process that has similarities to radio broadcasting.(a) Is this process AM or FM (b) What is the carrier frequency (c) What is the signal frequency (d) What is the broadcasting antenna (e) What is the receiving antenna