Search results
Results From The WOW.Com Content Network
In this chapter, we first discuss the need for displacement current and its consequences. Then we present a descriptive account of electromagnetic waves. The broad spectrum of electromagnetic waves, stretching from g rays (wavelength ~10–12 m) to long radio waves (wavelength ~106 m) is described.
This is a textbook on electromagnetic wave theory, and topics essential to the understanding of electromagnetic waves are selected and presented. Chapter 1 presents fundamental laws and equations for electromagnetic theory. Chapter 2 is devoted to the treatment of transmission line theory.
example and study the electromagnetic waves that propagate down a coaxial cable. This example should help convince you that light is in fact an electromagnetic wave.
What are electromagnetic waves? How are they created, and how do they travel? How can we understand and organize their widely varying properties? What is their relationship to electric and magnetic effects? These and other questions will be explored. Misconception Alert: Sound Waves vs. Radio Waves.
Electromagnetic waves with wavelengths in the visible spectrum (λ ∼ 10−6 m) are called light. Red light has a longer wavelength than blue light. Longer wavelengths than red go into infrared, then microwaves, then radio waves. Smaller wavelengths than blue are ultraviolet, then x rays than γ rays.
Scientists name the different regions of the elec-tromagnetic spectrum according to their wave-lengths. (See figure 1.) Radio waves have the longest wavelengths, ranging from a few centime-ters from crest to crest to thousands of kilometers.
lead us to an understanding of the properties of electromagnetic waves. Lecture Outline 1. Producing and Detecting Electromagnetic Waves 2. Properties of Electromagnetic Waves 3. Maxwell's Equations and Waves in Free Space 4. The Electromagnetic Spectrum 5. The Poynting Vector 6. Radiation Pressure and Momentum Transfer 1.
Light moves through materials, but faster in a vacuum. Light propagates by a chain reaction of electric and magnetic fields recreating each other. Light in air moves at hundreds of millions of meters per second. Visible light has frequencies over a range of less than one octave, from 430 to 750 Terahertz.
Electromagnetic waves are generated by oscillating electric charges. The waves radiated from the oscillating charges can be detected at great distances. Electromagnetic waves carry energy and momentum.
13.4 Plane Electromagnetic Waves. To examine the properties of the electromagnetic waves, let’s consider for simplicity an electromagnetic wave propagating in the +x-direction, with the electric field E pointing in the +y-direction and the magnetic field B in the +z-direction, as shown in Figure 13.4.1 below.