Transmission Media • Transmission medium – Physical path between transmitter and receiver – May be guided (wired) or unguided (wireless) – Communication achieved by using em waves • Characteristics and quality of data transmission – Dependent on characteristics of medium and signal – Guided medium ∗ Medium is more important in setting transmission parameters – Unguided medium ∗ Bandwidth of the signal produced by transmitting antenna is important in setting transmission parameters ∗ Signal directionality
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expand to its features. The earliest smart phones let users access email‚ and use the phone as a fax machine‚ pager‚ and address book. (insite.artinstitute.edu) These electromagnetic waves are made up of two parts. The first part is an electric field. The second part is a magnetic field. So that is why they are called electromagnetic waves. The two fields are at right angles to each other. (www.scribd.com) Nowadays‚ mobile phones have been part of people’s life. Some are having a hard time without
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their family. Many teenagers who use the computers don’t seem realize that sitting in front of the computer is harmful at all. The electromagnetic waves from the computer-screen make our brain cells get stiffen every second. Human eyes can also lose its focus and get dehydrated easily because the ELF‚ VLF‚ RF and MICROWAVE (types of injurious electromagnetic waves). These harmful waves can cause headache‚ drop in eyesight‚ a brain tumor and leucosis in the worst case. Moreover‚ sitting in
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Network users and even network architects are not always aware that at certain fragments of the network path‚ information is not being transmitted through wires. Instead‚ it is propagated through the Earth’s atmosphere or space in the form of electromagnetic waves. This might happen when a computer network leases a channel from a communications carrier and the specific link of such a channel is a satellite or terrestrial microwave link. Reference: COMPUTER NETWORKS principles‚ technologies and
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Waves Assignment Microwave Ovens Microwave ovens‚ or microwaves‚ are kitchen appliances which use microwave radiation to cook‚ heat or defrost food. Properties of a microwave: Microwaves are electromagnetic waves with wavelengths longer than those of Terahertz (THz) wavelengths‚ but relatively short for radio waves. Microwaves have wavelengths approximately in the range of 30 cm (frequency = 1 GHz) to 1 mm (300 GHz). The word microwave generally refers to "alternating current signals with
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volts. Vary the wavelength of the light source (from Infra Red to Ultra Violet) until electrons just begin to be ejected from the sodium surface. State the wavelength and note the speed of the electrons. What is the corresponding frequency of the electromagnetic wave? Why is it called threshold frequency? 2. Repeat the instruction 1 above but allow the light to shine on the metal for a longer time before the wavelength is varied. Is your finding different as found in 1? Justify your finding.
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consideration. There are also many tools that ghost hunters use to sometimes detect if they are there. One of these tools is called an Electromagnetic Field Detector‚ also known as an EMF‚ is the modern day ghost researcher’s tracking device. With this instrument it is possible to locate and track energy sources. It will detect fluctuations in electromagnetic fields and low strength moving EMF fields that have no source. It is a common theory that spirits disrupt this field in a way that you
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Recommendation It is a pleasure to write a letter of recommendation for Mr. Rutwik Reddy Reddy‚ a deserving student‚ for admission to pursue Master’s Degree at your University. I have taught him the courses of “Electromagnetic waves and Transmission lines” and “Optical Communications” .This interaction with him provides me sufficient information to gauge and asses the intellectual capability and analytical skills that he has developed during his course.
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THEORETICAL STUDY ON MICROWAVE ASSISTED BONDING OF POLYMER BASED MICROFLUIDIC DEVICES By KASI BALAMURUGAN MANI A thesis submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN MECHANICAL ENGINEERING WASHINGTON STATE UNIVERSITY School of Mechanical and Materials Engineering May 2013 To the Faculty of Washington State University: The members of the Committee appointed to examine the thesis of KASI BALAMURUGAN MANI‚ find it satisfactory and recommend that it
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the emission of electrons from a metal surface under the illumination of a suitable radiation. The photoelectric effect is the phenomenon whereby electrons are emitted from a surface (usually metallic) upon the exposure to and absorption of electromagnetic radiation‚ such as visible light‚ that is above the threshold frequency. This is because electrons cannot get enough energy to overcome their atomic bonding. The photoelectric effect furthered wave particle duality‚ whereby physical systems (i
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