Electromagnetic Waves Flashcards
What controls the frequency of an antenna?
The length of the antenna, the shape and size of the antenna, and the electrical properties of the transmitting and receiving devices.
How is a changing electromagnetic wave produced by an antenna?
An antenna produces electromagnetic waves by the oscillation of electrons or electric charge. When a voltage is applied, the electrons within the antenna alternately accumulate at the ends causing an oscillating electric field.
Differentiate between the processes of AM and FM radio transmission
The difference is in how the carrier wave is modulated, or altered. With AM radio, the amplitude, or overall strength, of the signal is varied to incorporate the sound information. With FM, the frequency of the carrier signal is varied.
