emissions are electromagnetic radiations which occur due to the spontaneous disintegration of unstable nuclei. Natural elements with atomic number greater than 83 and isotopes of some lighter elements are found to be radioactive. They are categorized as alpha‚ beta and gamma radiations. Alpha particles are positively charged helium-4 nuclei ‚ beta particles are high energy-high speed electrons while gamma rays unlike alpha and beta radiation have no mass and charge and are short electromagnetic waves consisting
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very dangerous situation for an agriculture based country like india. We hope these findings throw some light on the grave situation and let people think about the alternates. Electromagnetic waves or radiation [pic] The electromagnetic waves that compose electromagnetic radiation can be imagined as a self-propagating transverse oscillating wave of electric and magnetic fields. This diagram shows a plane linearly polarized EMR wave propagating from left to right. The electric
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Hertz‚ was testing Maxwell’s Theory of Electromagnetic Waves. Hertz discovered that ultraviolet light discharged certain electrically charged metallic plates‚ a phenomenon that could not be explained by Maxwell’s Wave Theory. In order to explain this phenomenon termed the photoelectric effect‚ because both light and electricity are involved‚ the Quantum Theory was developed. The Photoelectric Effect Maxwell’s work with the Theory of Electromagnetic Waves may seem to have solved the problem
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Topic 4: Oscillations and Waves 10 hours 4.1 Kinematics of simple harmonic motion (SHM) 2 hours | |Assessment statement |Obj |Student Notes | |4.1.1 |Describe examples of oscillations. |2 |A mass hanged with a spring | | | | |A pendulum
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important wave phenomenon‚ the surface wave. It occurs in many physical systems both mechanical and electromagnetic. Mechanical surface waves can exist at the interface between two media with different densities such as the oceans and air. Ordinary sea waves and tsunamis are surface waves. Seismic events can produce both longitudinal and shear waves at the earth’s surface‚ resulting in earthquakes. Electromagnetic surface waves can occur at the interface between dielectric and con-ductive media or between
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| | Assignment 2 | | Subject: General ChemistryLecturer: Dr. Ajith H. Herath | | Name: Kavini de Silva | 4/5/’013 | | BOHR THEORY Introduction Niels Bohr applies quantum theory Rutherford’s Atomic Structure by assuming that electrons travel in stationary orbits defined by their angular momentum. This led to the calculation of possible energy levels for these orbits and the postulation that the emission of light occurs when an electron moves into a lower
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Tyndall effect‚ the longer-wavelength light is more transmitted while the shorter-wavelength light is more reflected via scattering. An analogy to this wavelength dependency is that longwave electromagnetic waves such as radio waves are able to pass through the walls of buildings‚ while shortwave electromagnetic waves such as light waves are stopped and reflected by the walls. The Tyndall effect is seen when light-scattering particulate-matter is dispersed in an otherwise-light-transmitting medium
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References: 1. Campbell‚ N (1999) Biology‚ Benjamin-Cummings Publ. Co.‚ California [http://biology.clc.uc.edu/courses/bio104/photosyn.htm] 2. Davidson‚ S. (2007) Electromagnetic Radiation‚ Maricopia Education‚ New York‚ http://www.nationalelectrical.com/clncmpd.htm [13/03/2010] 3. Eates‚ P. J. (2004) Electromagnetic Spectrum‚ The Share Guide‚ Sydney‚ [http://www.lbl.gov/] 4. Farabee‚ M (2007) Photosynthesis and Light‚ Maricopia Education‚ New York [http://www.emc.maricopa.edu/faculty/farabee/biobk/biobookps
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both microwaves and longer radio waves. These are transmitted in two ways: amplitude modulation (AM ) and frequency modulation ( FM ). These two kinds of wave have many differences. Radio waves are among the many types of electromagnetic waves that travel within the electromagnetic spectrum. Radio waves can be defined by their frequency (in hertz‚ after Heinich Hertz ‚ who first produced radio waves electronically)‚ which is number of times they pass through a complete cycle per second; or by their
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MICROWAVE COMMUNICATION-overview STRUCTURE 1.1 INTRODUCTION 1.2 Objective 1.3 Classification of Electromagnetics wave 1.4 MICROWAVE 1.5 6 GHz Digital M/W SYSTEM 1.6 Summary 1.7 REFERENCES AND SUGGESTED FURTHER READINGS 1 INTRODUCTION We use the radio portion of the electromagnetic spectrum for many things‚ including television and radio broadcasting‚ telephones and other wireless communications‚ navigation and radar for a variety of measurements including
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