PPT-Microwaves

History of Microwaves In 1945 Dr Perry Spencer a scientist was working in a lab when he felt some heat on his hand The heat was coming from microwaves These were being emitted from a nearby vacuum tube Dr Spencer was curious and place a chocolate bar near the tube Within seconds the chocolate melted That sticky mess was the beginning of a brilliant idea the microwave. Square wave operation the klystron output frequency Note Note brPage 4br Exercise 2 Mode studies on oscilloscope Figure 3 Set up for oscilloscope studies of the klystron the reflector voltage axis the power axis Figure 4 A mode pattern the modetop f 10 No 1 June 2011 Brazilian Microwave and Optoelectronics SocietySBM O received 19 Jan 2009 revised 23 July 2010 acce pted 21 Sept 2010 Brazilian Society of ElectromagnetismSBMag 57513 2011 SBMOSBMag ISSN 21791074 Abstract The study presented in th Multiplugs Ecigaretteshookahs For more information about what to bring to campus visit hofstraeducheckin All residence halls are smokefree Permitted in the Graduate Residence Hall only Please refer to the section on RefrigeratorFreezerMicrowave Re Cable Losses for Gardiner Signal Xmitter0.0020.0040.0060.0080.00100.00120.00123456789Coaxial cable length M.Percentage of signal. Westflex 103 XR63 (UR67) Thin Ethernet BICC H9590 HDF400 the antenna. 5 (Oct. 13). Comparisons. Comparing dimensions, properties and quantities.. Comparatives. Sentences that compare two things:. …… . comparative . (adjective . -. er. ) . ‘than’. . ……….. History of Microwaves. In 1945, Dr. Perry Spencer, a scientist, was working in a lab when he felt some heat on his hand. The heat was coming from microwaves. These were being emitted from a nearby vacuum tube. Dr. Spencer was curious and place a chocolate bar near the tube. Within seconds, the chocolate melted. That sticky mess was the beginning of a brilliant idea – the microwave!. Or . What . happens when you put things in a microwave . that . you shouldn’t put in a microwave. ?. with. Oliver Barker (Science and History of Microwave Cooking). Adam . Theaker. (Foam and Lightning). By Tyler Miller. The Microwave Oven. The first personal microwave was introduced in 1967 by the Amana Corporation. The first microwave for home use was introduced by Tappan in 1955. .. The heating effect of microwaves was discovered accidentally in. Are Mobile Phones Safe?. Week 5. March 2013. In the event of…. In the event of . a new ice age…. In the event of…. In the event of…. This evening…. 0. The Media!. How do mobile phones work?. Kowtaluk, Helen and Orphanos Kopan, Alice. . Food For Today. . McGraw Hill-Glencoe. 2004.. Microwave Cooking Techniques. Microwave Oven Basics. Fast, healthful way to cook. Food cooks quickly with less fat and liquid; less nutrient loss. Microwave ovens generate electromagnetic waves (called microwaves) which makes water move. This motion leads to friction, and friction leads to heating. Microwave heating works by heating water in foods by making water molecules vibrate. That is why dry foods like . ID: 200800667. Outline. The electromagnetic spectrum. Microwaves . Uses of microwaves. Why use microwaves. The Electromagnetic . S. pectrum. Radiations travel as waves. Types of electron radiation. Radio Large wave length. Microwaves:. Microwaves are electromagnetic waves with a frequency with wavelengths ranging from one meter to one millimeter (frequencies between 300 MHz and 300 GHz).. Microwaves are ideal when large areas need to be covered and there are no obstacles in the path.. Magnetron is a device which generates Microwaves. . It converts electrical energy into Microwaves.. Construction and Working : . It is constructed of a . Vaccum. tube having two electrodes. . It comprises a cylindrical diode working as a cathode, an anode, and a magnet that generates a magnetic field aligned with the cathode.