Document
... fields of an electromagnetic wave are perpendicular to each other and to the direction of the wave. James Clerk Maxwell and Heinrich Hertz are two scientists who studied how electromagnetic waves are formed and how fast they travel. ...
... fields of an electromagnetic wave are perpendicular to each other and to the direction of the wave. James Clerk Maxwell and Heinrich Hertz are two scientists who studied how electromagnetic waves are formed and how fast they travel. ...
Chapter 33 - Electromagnetic Waves
... Both of these equations are called "wave equations," the same form as the wave equation for waves on strings. The solution is of the form f(x - vt) or f(x + vt). For equation 3 a solution can be ...
... Both of these equations are called "wave equations," the same form as the wave equation for waves on strings. The solution is of the form f(x - vt) or f(x + vt). For equation 3 a solution can be ...
Chapter 24: Electromagnetic Waves
... waves? (a) magnitude of the Poynting vector (b) energy density uE (c) energy density uB (d) wave intensity Answer: (d). The first three choices are instantaneous values and vary in time. The wave intensity is an average over a full cycle. 4. In an apparatus such as that in Figure 24.11, suppose the ...
... waves? (a) magnitude of the Poynting vector (b) energy density uE (c) energy density uB (d) wave intensity Answer: (d). The first three choices are instantaneous values and vary in time. The wave intensity is an average over a full cycle. 4. In an apparatus such as that in Figure 24.11, suppose the ...
เนื้อหาของรายวิชา 2304104 GEN PHYS II
... Electric field and electric potential due to continuous charge distribution and dipole Calculating the field from the potential Capacitance and Dielectric Electric current and electromotive force Conductivity of material 2) Eletromagnetic Induction Current and magnetic field Biot-Savar ...
... Electric field and electric potential due to continuous charge distribution and dipole Calculating the field from the potential Capacitance and Dielectric Electric current and electromotive force Conductivity of material 2) Eletromagnetic Induction Current and magnetic field Biot-Savar ...
PPT
... Morley looked and looked, and decided it wasn’t there. How do waves travel??? Electricity and magnetism are “relative”: Whether charges move or not depends on which frame we use… This was how Einstein began thinking about his “theory of special relativity”… We’ll leave that theory for later…maybe. ...
... Morley looked and looked, and decided it wasn’t there. How do waves travel??? Electricity and magnetism are “relative”: Whether charges move or not depends on which frame we use… This was how Einstein began thinking about his “theory of special relativity”… We’ll leave that theory for later…maybe. ...
interference
... produced by an air wedge. Red light with a wavelength of 638 nm is used on an air wedge that is 25.0 cm long. If 10 bright fringes are counted across 1.06 cm in the air wedge, what is the thickness of the hair? 7. A soap film in air has a thickness of 175 nm. If the index of refraction of the soap f ...
... produced by an air wedge. Red light with a wavelength of 638 nm is used on an air wedge that is 25.0 cm long. If 10 bright fringes are counted across 1.06 cm in the air wedge, what is the thickness of the hair? 7. A soap film in air has a thickness of 175 nm. If the index of refraction of the soap f ...
Waves, incl. Electromagnetic Waves, Light
... disappears if either source A or source B is turned off. This implies a seemingly paradoxical situation: adding a 2nd source reduces the wave effect at certain locations (marked 0)! Precisely the nature of interference, though. Also very important: the two sources A & B must be synchronized, i.e. if ...
... disappears if either source A or source B is turned off. This implies a seemingly paradoxical situation: adding a 2nd source reduces the wave effect at certain locations (marked 0)! Precisely the nature of interference, though. Also very important: the two sources A & B must be synchronized, i.e. if ...
22-2 Electromagnetic Waves and the Electromagnetic
... Our eyes are sensitive to electromagnetic (EM) waves that have wavelengths in the visible spectrum, between 400 and 700 nm, but our bodies can be affected by EM waves in other ways, too. We have some sensors on the backs of our hands, in particular, that are sensitive to infrared radiation, which we ...
... Our eyes are sensitive to electromagnetic (EM) waves that have wavelengths in the visible spectrum, between 400 and 700 nm, but our bodies can be affected by EM waves in other ways, too. We have some sensors on the backs of our hands, in particular, that are sensitive to infrared radiation, which we ...
Let There Be Light
... C) The existence of electromagnetic waves was predicted by Maxwell. D) Electromagnetic waves can propagate through a material substance. E) Electromagnetic waves do not require a physical medium for propagation. ...
... C) The existence of electromagnetic waves was predicted by Maxwell. D) Electromagnetic waves can propagate through a material substance. E) Electromagnetic waves do not require a physical medium for propagation. ...
Lecture 32 - McMaster Physics and Astronomy
... electric field by the time-varying magnetic field and the induction of a magnetic field by a timevarying electric field • The electric and magnetic field produced in this manner are in phase with each other and vary as 1/r • The result is the outward flow of energy at all times ...
... electric field by the time-varying magnetic field and the induction of a magnetic field by a timevarying electric field • The electric and magnetic field produced in this manner are in phase with each other and vary as 1/r • The result is the outward flow of energy at all times ...
Astronomy 1010
... Light is also an electromagnetic wave The wavelength is the distance between adjacent peaks of the electric or magnetic field 1 nm (nanometer) = 10–9 m 1μm (micron) = 10–6 m The frequency is the number of peaks that pass by any point each second, measured in cycles per second or Hertz (Hz). ...
... Light is also an electromagnetic wave The wavelength is the distance between adjacent peaks of the electric or magnetic field 1 nm (nanometer) = 10–9 m 1μm (micron) = 10–6 m The frequency is the number of peaks that pass by any point each second, measured in cycles per second or Hertz (Hz). ...
The electromagnetic Spectrum
... These crystals are needle-like in shape and have their axes parallel to each other. The crystals transmit light vibrating in the same plane as the crystal axis and absorb light vibrating at right angles to this plane. ...
... These crystals are needle-like in shape and have their axes parallel to each other. The crystals transmit light vibrating in the same plane as the crystal axis and absorb light vibrating at right angles to this plane. ...
109 HW#18
... (a) a steady direct current (b) an accelerating electron (c) a proton in simple harmonic motion (d) an alternating current (e) charged particles traveling in a circular path in a mass spectrometer ...
... (a) a steady direct current (b) an accelerating electron (c) a proton in simple harmonic motion (d) an alternating current (e) charged particles traveling in a circular path in a mass spectrometer ...
Chap 24 S2016
... as glass at a speed that is substantially less than c. In 1865, Maxwell determined theoretically that electromagnetic waves propagate through a vacuum at a speed given by, ...
... as glass at a speed that is substantially less than c. In 1865, Maxwell determined theoretically that electromagnetic waves propagate through a vacuum at a speed given by, ...
Electromagnetic radiation
Electromagnetic radiation (EM radiation or EMR) is the radiant energy released by certain electromagnetic processes. Visible light is one type of electromagnetic radiation, other familiar forms are invisible electromagnetic radiations such as radio waves, infrared light and X rays.Classically, electromagnetic radiation consists of electromagnetic waves, which are synchronized oscillations of electric and magnetic fields that propagate at the speed of light through a vacuum. The oscillations of the two fields are perpendicular to each other and perpendicular to the direction of energy and wave propagation, forming a transverse wave. Electromagnetic waves can be characterized by either the frequency or wavelength of their oscillations to form the electromagnetic spectrum, which includes, in order of increasing frequency and decreasing wavelength: radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays.Electromagnetic waves are produced whenever charged particles are accelerated, and these waves can subsequently interact with any charged particles. EM waves carry energy, momentum and angular momentum away from their source particle and can impart those quantities to matter with which they interact. Quanta of EM waves are called photons, which are massless, but they are still affected by gravity. Electromagnetic radiation is associated with those EM waves that are free to propagate themselves (""radiate"") without the continuing influence of the moving charges that produced them, because they have achieved sufficient distance from those charges. Thus, EMR is sometimes referred to as the far field. In this jargon, the near field refers to EM fields near the charges and current that directly produced them, specifically, electromagnetic induction and electrostatic induction phenomena.In the quantum theory of electromagnetism, EMR consists of photons, the elementary particles responsible for all electromagnetic interactions. Quantum effects provide additional sources of EMR, such as the transition of electrons to lower energy levels in an atom and black-body radiation. The energy of an individual photon is quantized and is greater for photons of higher frequency. This relationship is given by Planck's equation E=hν, where E is the energy per photon, ν is the frequency of the photon, and h is Planck's constant. A single gamma ray photon, for example, might carry ~100,000 times the energy of a single photon of visible light.The effects of EMR upon biological systems (and also to many other chemical systems, under standard conditions) depend both upon the radiation's power and its frequency. For EMR of visible frequencies or lower (i.e., radio, microwave, infrared), the damage done to cells and other materials is determined mainly by power and caused primarily by heating effects from the combined energy transfer of many photons. By contrast, for ultraviolet and higher frequencies (i.e., X-rays and gamma rays), chemical materials and living cells can be further damaged beyond that done by simple heating, since individual photons of such high frequency have enough energy to cause direct molecular damage.