This occurs, for example, when timevarying currents run up and down the transmitter of a radio station or when atoms bounce around inside a fluorescent light bulb. This information will be particularly interesting to students who have studied electromagnetism already. Sep 11, 2014 making electromagnetic waves an em wave travels in all directions. They can go forever until absorbed by some charges along the way. Suppose an electromagnetic plane wave with direction of propagation to be constructed, where is a. To understand how induced electric and magnetic fields lead to electromagnetic waves. Visible light waves visible light waves are the only electromagnetic waves we can see. Electromagnetic plane wave of frequency and wave vector. Electromagnetic waves are nothing but electric and magnetic fields travelling through free space with the speed of light c. The ratio of the efield to the bfield is constant and equal to the velocity cc electromagnetic waves carry both energy and momentum and can exert pressure on surfaces.
It looks more familiar when reduced a plane wave with field in the xdirection only. The article below elaborates on the origin and theory of electromagnetic waves. The symposium provided a forum for discussing electromagnetic wave theory and tackled a wide range of topics, from propagation in nonlinear media to electromagnetic wave propagation and. There is a bit in there about ionising and nonionising radiation too. Preface to the present edition the present book titled, electromagnetics. By radio waves we mean the area of the electromagnetic spectrum from approximately 3 khz to 300 ghz. If the frequency of oscillation of the charged particle is f, then it produces an electromagnetic wave with frequency f. The law of reflection snells law of refraction total.
The propagating electric and magnetic ripples interact with and support each other. G givens write them all down with symbols, numbers and units u unknown write down the unknown with a. To apply the wave model to the electromagnetic spectrum. The news that acceleration has occurred travels outward at the speed of light c. For example, light waves are reflected by skin but xrays pass straight through. They are all the same kind of wavy disturbance that repeats itself over a distance which is called the wavelength. This means that although they appear to be very different, in fact theyre all made of the same kind of vibrations but at different. The electromagnetic spectrum t e harrington middle school. In the first hyperframe em field frame, this can be seen to be simply a space charge of electrons conducting a wave disturbance through it, or a piece of ordinary conductive matter conducting an ordinary em wave. Red has the longest wavelength and violet has the shortest wavelength.
Electromagnetic waves free download as powerpoint presentation. Chapter maxwells equations and electromagnetic waves. Waves powerpoint presentation electromagnetic radiation. Gravitational force coulomb 1 2 1 on 2 2 on 1 2 0 1 4 f fcoulomb q q r 1 2 1 on 2 2 on 1 2 f f ggravity gravity m m r. The grades of the quiz will be taken into you ca for semester 2, and you can only do it once, so please make sure you understand the content of this unit. To understand the properties of different types of electromagnetic waves. An introduction to the em spectrum going through each of the different types of waves with their frequencies, wavelengths, uses and dangers. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. Electromagnetic wave is a wave in which electric and magnetic fields are perpendicular to each other and also perpendicular to the direction of propagation of wave. Aug 18, 2016 apr 30, 2020 em waves powerpoint presentation, physics, class 12, cbse, ncert class 12 notes edurev is made by best teachers of class 12. Below the radio waves in the frequency domain there are low frequency and static electric and magnetic. Mother of em waves modification to ampere circuital law 7 amperes law statement. To adjust the wavelength and simultaneously, the frequency of the wave, translate either the wavelength or frequency sliders to the left or right. Wavelength electromagnetic waves have crests and troughs similar to those of ocean waves.
Electromagnetic principles are fundamental to the study of electrical engineering and physics. Em waves powerpoint presentation, physics, class 12. Waves powerpoint presentation electromagnetic radiation waves. Electromagnetic waves can transfer energy as well as momentum to objects placed on their paths. Electromagnetic theory is also indispensable to the understanding, analysis and design of various electrical, electromechanical and electronic. All electromagnetic waves travel at the same speed. Electromagnetic radiation is characterized by a broad range of wavelengths and frequencies, each associated with a specific intensity or amplitude and quantity of energy. Wave interference two waves moving in the same direction with the same amplitude and same frequency form a new wave with amplitude. Electromagnetic waves oscillating charges also generate a oscillating current, which in turn produces oscillating magnetic field ripples propagating away.
All electromagnetic waves travel at the same speed 300,000,000 metres per second, which is the speed of light. Above is shown how an electromagnetic wave moves far away from an antenna where it is generated. Waves powerpoint presentation free download as powerpoint presentation. Electromagnetic waves electromagnetic em radiation is created whenever charges accelerate. Maxwells equations govern all of electricity and magnetism, so it is no surprise. Lecture notes 6 electromagnetic waves in matter electromagnetic wave propagation in linear media we now consider em wave propagation inside linear matter, but only in regions where there are no free charges free 0 andor free currents kfree 0 i.
Classical and relativistic approaches, is an extended form of the previous two editions of the books titled electromagnetics. The em spectrum is the entire range of em waves in order of increasing frequency and decreasing wavelength. It can also be said that electromagnetic waves are the composition of oscillating electric and magnetic fields. Vector addition can be represented using a parallelogram pr. An accelerating charged particle is when the charged particle oscillates about an equilibrium position. Ppt electromagnetic waves powerpoint presentation free. Electromagnetic spectrum instructions duration of lesson. To calculate the intensity of light transmitted through a series of polarizing filters. Em waves powerpoint presentation, physics, class 12, cbse. Electromagnetic waves all electromagnetic waves travel at the same speed through space the speed of light gamma rays, xrays, ultraviolet waves, light, infrared rays, microwaves, and radio waves are all electromagnetic waves with different wavelengths some substances absorb em waves, some reflect them and others transmit them. A worksheet that will guide students to working with the em spectrum and getting used to working with frequency, wavelength and energy of a wave. Making electromagnetic waves the electric and magnetic fields vibrate at right angles to the direction the wave travels so it is a transverse wave.
Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that. A free powerpoint ppt presentation displayed as a flash slide show on id. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Making electromagnetic waves an em wave travels in all directions. Ppt electromagnetic spectrum powerpoint presentation free. Electromagnetic waves carry energy as they propagate through space. To understand electromagnetic waves and how they propagate.
Lesson plan and powerpoint for lesson on electromagnetic spectrum. Frequency is measured in cycles per second hertz or hz or khz, wavelength is measured in meters m or nanometers nm. Both e e and b b are perpendicular to wave velocity c. Electromagnetic waves what are electromagnetic waves. Lecture notes electromagnetic fields, forces, and motion. The shortest wavelengths are just fractions of the size of an atom, while the longest wavelengths scientists currently study can be larger than the diameter of our planet. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. How the waves behave, depends on their energy and the type of material. Documents for field and wave electromagnetics cheng pdf. Basic electromagnetic wave properties java tutorial. This section serves as motivation for the fact that light is an electromagnetic wave. Apr 30, 2020 em waves powerpoint presentation, physics, class 12, cbse, ncert class 12 notes edurev is made by best teachers of class 12. Introduction to the electromagnetic spectrum science mission. This document is highly rated by class 12 students and has been viewed 5877 times.
The grades of the quiz will be taken into you ca for semester 2, and you can only do it once, so please make sure you understand the. Winner of the standing ovation award for best powerpoint templates from presentations magazine. Chapter 6 maxwells equations for electromagnetic waves. Electromagnetics and applications mit opencourseware. By micro waves we mean radio waves with the frequency over 1 ghz. Wave a periodic disturbance in a solid, liquid or gas as energy is transmitted through a medium waves carry energy bc they do work waves create wave fronts circles that have the same amount of total energy but as the. Electromagnetic energy travels in waves and spans a broad spectrum from very.
Light, microwaves, xrays, tv and radio transmissions are all kinds of electromagnetic waves. Electromagnetic waves travel through vacuum without the requirement of a medium. Electromagnetic waves and polarization approximate time three 100minute sessions hey diddle diddle, what kind of riddle is this nature of light. Substitute amperes law for a charge and currentfree region.
The speed of light is pretty fast but it is finite. Electromagnetic waves are also known as em waves that are produced when an electric field comes in contact with the magnetic field. Introduction electromagnetic theory is a discipline concerned with the study of charges at rest and in motion. Beat frequency beats are loud sounds separated by soft sounds the beat frequency is the difference of the frequencies of the two waves that are being added. Electromagnetic wave theory, part 2 contains the proceedings of a symposium on electromagnetic wave theory held at delft, the netherlands in september 1965. Ppt electromagnetic spectrum powerpoint presentation. The new book, at the difference of the previous ones, contains four new appendices. The figure only shows a wave traveling in one direction. Waves electromagnetic ks4gcse physics teaching resources. Energies associated with waves in the tutorial appear beneath the window and are given in units of kjmole. Electromagnetic wave theory a university of washington. Electromagnetism is defined as the combination of alternating electric and magnetic fields created by accelerated charges that propagate out from these charges at the speed of light in. Vectors can be added together, but the same units must be used, just like in scalar addition.
Electromagnetic waves obey the principle of superposition. Asks students to fill in missing parts of the spectrum, and to draw a wave. Mechanical waves longitudinal transverse slinky sound wave water wave a wave at a ball game guitar string flag waving in the wind shaking a rope water wave electromagnetic waves light. Scribd is the worlds largest social reading and publishing site. This energy is divided equally between electric and magnetic fields. Lessons lecture notes the physics classroom conceptual light waves and color. In this discussion, vectors are denoted by boldfaced underscored lowercase letters, e. Line integral of magnetic field around a closed path is equal to the current enclosed by that path amperes law 1 dqdt q 00 inconsistency in amperes law t current o transportation of charged particles w. The electromagnetic spectrum can be expressed in different terms, or units. When all the waves are seen together, they make white light.
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