Each of us lives on big earth family‚ the earth provides us wealthy resources and energy .Nowadays，with rapid development of human science and technology‚ people crazy grab the earth’s resources‚ especially after the second industrial revolution accelerated the lighting industry and undoubtedly exacerbate the greenhouse effect and exhausted the earth energy. people crazy mining coal to generate electricity‚ harmful gas and dust and coal combustion has aggravated the earth’s atmospheric pollution
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field B 1.8 T‚ and moves perpendicular to the field lines with a speed v 0.92c. What is the radius of curvature of its path? See hint for Problem 42. 4) Producing an electron and a positron (Q53; Giancoli Chap 26) What minimum amount of electromagnetic energy is needed to produce an electron and a positron together? A positron is a particle with the same rest mass as an electron‚ but has the opposite charge. (Note that electric charge is conserved in this process. See Section 27–6.) 5) Running
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Title: Spectrophotometric analysis of a two-component mixture Aim: i. To prepare working standards of dichromate and permanganate ii. To measure the absorbance of the prepared working standards of dichromate and permanganate using a spectrophototometer iii. To determine the concentrations of permanganate in a mixture of unknown. Abstract: Working standards of dichromate and permanganate were prepared and absorbance for each found. This was done in order to plot
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and caused the compass to not point in the direction of the current. He later proved this through an experiment which became a huge breakthrough in this time period. In future experiments Michael Faraday proposed that light is really just an electromagnetic wave‚ but it took almost 15 years for him to convince the skeptics that this is really true. This was due to the help of Professor James Clerk Maxwell who through the use of his mathematical skill was able to back up Faraday’s proposal. James
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MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Electrical Engineering and Computer Science Problem Set No. 2 6.632 Electromagnetic Wave Theory Issued: 02/15/07 R Spring Term 2007 Due: 02/22/07 R -----------------------------------------------------------------------------Reading assignment: Section 3.2 J. A. Kong‚ “Electromagnetic Wave Theory” Problem P2.1 (a) The complex permittivity for bottom round steak is about = 40(1 + i0.3) o at the operating frequency (2.5 GHz) of a microwave oven. What
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Singh‚ Hanumant; Adams‚ Jonathan; Mindell‚ David; and Foley‚ Brendan 2000 Imaging Underwater for Archaeology. Journal of Field Archaeology volume 27 number 3: 319-328. The article by the various authors listed above concentrated on the various techniques that are used to locate and then to excavate these sites. They list and discuss the various techniques that they use. These vary from side-scanning to locate the sites to high resolution video to see how the site appears and the various locations
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but what? This could be viewed as light and energy‚ because the wavelength of the light determines the color of it on the visible spectrum. 3.) Why do different things release different colors when burned? Different elements release different amounts of energy when their atoms absorb it‚ and this difference of energy means a different wavelength on the visible spectrum‚ therefore changing the color of the elements‚ explaining why different elements have different colors. 4.) Relate this information
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(579nm)Yellow-Green (570nm)6Yellow (575nm)More Yellow (583nm)Red (675nm)7Red (649nm)Red (700nm)Redder (690nm)8Redder (680nm)Redder (710nm)Reddest (705nm)9Reddest (700nm)Reddest (720nm) 2 Describe the line spectrum of the star. Give the color and wavelength value of the five brightest lines in the spectrum. 3 The spectrum of a star has a lot more wavelength values than any of the others. The five brightest lines are: Purple (415nm)‚ Turquoise (500nm)‚ Green (550)‚ Yellow (585nm)‚ Red (715nm). Conclusion: 1 Explain
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X-radiation (which is composed of X-rays‚ hence the name) falls under electromagnetic radiation. X-rays and gamma rays are sometimes confused‚ but they are different‚ as X-rays are emitted by electrons outside the nucleus whilst gamma rays are produced inside the nucleus. X-rays have extremely small wavelengths (10-0.1 nanometers)
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New forensic laser technique for hair analysis Using a new laser technique‚ Jim Moran and his colleagues at Pacific Northwest National Laboratory‚ have devised a method of separating out the parts of hair samples that can reveal details about the recent history of the person to whom it belongs. In their paper‚ published in Rapid Communications in Mass Spectrometry‚ they describe a process they’ve devised whereby hair samples are pulled apart‚ rather than burned as a whole before being measured
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