How a Microwave Works By Zach Betten [pic] What is a Microwave? A microwave oven or microwave is a kitchen appliance that cooks or heats food by using electromagnetic waves. This happens by using microwave radiation to heat materials such as water and other things within the food. This leads to food being more evenly heated throughout. Basic microwave ovens heat food quickly and efficiently. One setback is that they do not brown or bake food in
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various effects on people’s health. To begin with‚ cell phones are emitting radiation‚ electromagnetic wave‚ which is threatening people’s health. Firstly‚ radiation causes to die of brain cells which are not renewable. The die of brain cells may cause amnesia and because of not being renewable it cause early aging. Moreover‚ if cell phones are used longer than ten years‚ then their radiation forms brain tumors. Secondly‚ radiation affects heart rhythm. Disorder of rhythm leads to send blood to cells irregularly
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Primary radiation is also known as direct radiation. * Secondary Radiation (aka Scatter radiation & Leakage Radiaiton) * Scatter Radiation – results whenever a diagnostic x-ray beam passes through matter. * Compton interactions between the x-ray photons and the electrons of the atoms within attenuating object deflect x-ray photons from their initial trajectories. * X-ray photons emerge from the object in all direction. * Leakage Radiation – radiation generated
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Uses of Radiation in the Medical Industry Although scientists have only known about radiation since the 1890s‚ they have developed a wide variety of uses for this natural force. Today‚ to benefit humankind‚ radiation is used in medicine‚ academics‚ and industry‚ as well as for generating electricity. In addition‚ radiation has uses in such areas as agriculture‚ space exploration‚ law enforcement‚ geology and many others. However‚ in the medical industry‚ radiation is used for x-rays‚ therapeutic
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energy transformation is a change in the type of energy‚ for example a change from sound energy to electromagnetic waves. Relating this to the mobile telephone‚ it undergoes basic energy transformations of‚ sound wave (your voice)‚ to electrical energy (in the wires inside the phone)‚ to electromagnetic waves (from the phone to the tower)‚ to electrical energy (at the tower)‚ then to electromagnetic waves (to reach the receiving phone)‚ then electrical energy (inside the receiving phone)‚ then to
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photoelectric effect? The photoelectric effect is when a clean metal surface emits electrons after light‚ especially ultraviolet‚ has been shone on at it. This happens because of a process called photoelectric emission whereby a single photon package of electromagnetic energy‚ called a quantum‚ is absorbed by metal surfaces. This energy is then transferred to one single electron which can then be released by the metal and that released electron is known as a photoelectron. The effect was first absorbed by German
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BANK UNIT – I PART – A 1. What is retarded current? 2. Define hertzian dipole. 3. Define antenna gain. 4. What are the two types of radiation pattern? 5. State reciprocity principle. 6. Define antenna temperature. PART – B 1. Derive the expression for calculation of electromagnetic field due to an alternating current element. 2. Explain how the solutions to wave equations are arrived? 3. (i)Derive the relationship between directivity
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Chapter 13 – States of Matter Pressure (P) – the amount of force per unit area. Pressure=F/a or P=F/a Pascal’s Principle “Any change in pressure at a point on a confined fluid is transmitted throughout the fluid”. Any change is transmitted throughout the fluid. Buoyancy & Archimedes Principle “When an object is submerged in a fluid‚ it displaces a certain volume of that fluid. The amount of force pushing upward on the object is equal to the density of the fluid (Ï) times the acceleration
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MOBILE RADIATION CONTROL PROJECT REPORT DEPARTMENT OF INFORMATION TECHNOLOGY THIAGARAJAR COLLEGE
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Basic Physics Content with Answers 1. In the absence of air resistance‚ a ball of mass m is tossed upward to reach a height of 20 m. At the 10m position‚ half way up‚ the net force on the ball is A. 2mg. B. mg. C. mg/2. D. mg/4. B is correct‚ as a vector diagram would show. Other choices show carelessness or confusion between force and speed‚ and what constant acceleration means. 2. When you drop a ball it accelerates downward at 9.8 m/s2. If you instead throw it downward‚ then its acceleration
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