UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level PHYSICS Paper 2 AS Structured Questions 9702/02 October/November 2006 1 hour Candidates answer on the Question Paper. No Additional Materials are required. w w w e tr .X m eP e ap .c rs om READ THESE INSTRUCTIONS FIRST Write your Centre number‚ candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for
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The effect of differing wavelengths of visible light on the photosynthetic activity of Beta vulgaris Introduction Photosynthesis is a crucial biological process that occurs within the chloroplasts of plant cells where CO2 + H2O + Sunlight C6H12O6 + O2. The chloroplasts use light‚ an electromagnetic energy source‚ to produce food for the plant in the form of sugar molecules. During photosynthesis‚ the excited electrons from the light pass through proteins in the electron transport chain (ETC)‚ where
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wave at about 300‚000 k/s. also known as the speed of light. The more energy the photons have‚ the brighter the light will appear. The energy of electromagnetic waves are measured in the electromagnetic spectrum‚ a big graph showing the different wavelengths and frequencies of electromagnetic waves. It ranges from radio waves‚ which are the weakest‚ to gamma rays‚ the strongest -Only a very small part of the spectrum is visible to the human eye‚ called the visible light spectrum. These colors are
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The Big Bang Theory What is the Big Bang Theory? The Big Bang is the dominant (and highly supported) theory of the origin of the universe. In essence‚ this theory states that the universe began from an initial point or singularity which has expanded over billions of years to form the universe as we now know it. In 1959 a survey was conducted of scientists across America concerning their understanding of the physical sciences. One particular question asked “What is your concept of the age of
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investigated in a species of unicellular alga using the apparatus shown in Fig. 1.1. suspension of unicellular algae in water For Examiner’s Use 10.0 light of known wavelength oxygen probe magnetic stirrer Fig. 1.1 Two different strains of the species of alga were tested using a range of different wavelengths of light. • • Light of known wavelength was passed through the tube containing algae for two hours. The light transmission through the suspension and the oxygen concentration were then measured. light
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History of Pulse Oximetry Before the Pulse-Oximeter the only way to measure SpO2 was by using a painful arterial blood gas which took a minimum of 20-30 minutes to view the result. In 1974 Takuo Aoyagi a Niigata University student disclosed his first Pulse-Oximeter for the use of pilots in World War 2. He set about searching for a non-invasive way of monitoring arterial blood oxygen saturation. Nellcor’s pulse oximeter was put on the market in 1983 and this used his theory developed in 1974. By
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travel in waves. The difference in the colour depends on the wavelength of the light. Violet light has the shortest wavelength while red has the longest. There are other parts of the electromagnetic spectrum which includes infra-red‚ radar‚ television radio and micro- waves (past red on the spectrum)‚ and on the other end of the spectrum are the other invisible radiations‚ ultra- violet‚ X rays‚ micro waves and gamma rays. The wavelength of the light is important to the subject of the laser. A laser
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the structures of molecules with the molecules’ characteristic absorption of infrared radiation. Infrared spectrum is molecular vibrational spectrum. When exposed to infrared radiation‚ sample molecules selectively absorb radiation of specific wavelengths which causes the change of dipole moment of sample molecules. Consequently‚ the vibrational energy levels of sample molecules transfer from ground state to excited state. The frequency of the absorption peak is determined by the vibrational energy
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In this lab‚ we tested the effect of flame on different chemical solutions. In order to do this‚ we used a wooden stick soaked in a metal and nonmetal solution‚ hovered it over a bunsen burner‚ and recorded the color that the flame changed to. The seven solutions we tested were lithium chloride‚ strontium chloride‚ calcium chloride‚ sodium chloride‚ barium chloride‚ copper chloride‚ and potassium chloride. However‚ we had another four additional solutions‚ which had unknown chemical composition
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QUANTITATIVE DETERMINATION OF COPPER (II) CONCENTRATION BY SPECTROPHOTOMETRY D.DEL PRADO1‚ J. BELANO1‚ M.MAHUSAY2‚and M.FRANCISCO2 1 DEPARTMENT OF FOOD SCIENCE AND NUTRITION‚ COLLEGE OF HOME ECONOMICS 2INSTITUTE OF CHEMISTRY‚ COLLEGE OF SCIENCE UNIVERSITY OF THE PHLIPPINES‚ DILIMAN‚ QUEZON CITY 1101‚ PHILIPPINES DATE SUBMITTED: 12 MARCH 2013 DATE PERFORMED: 7 MARCH 2013 ------------------------------------------------- ------------------------------------------------- ABSTRACT -------------------------------------------------
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