Light bulbs operate at 2500 degrees C. i) What is the wavelength at which the most power is emitted for a light bulb operating at 2500 C? - 2500+273.15=2773K peak power at 1050nm ii) Explain why regular incandescent bulbs waste a lot of energy. Be sure to include your reasoning. - Because only about 12% of the energy goes into producing visible light. Much of the energy input is in a wavelength that is not visible‚ thus it is wasted. c) Use the Spectrum
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explained the process of how the eyes see the percept through wavelengths of light‚ which is transmitted at different wavelengths and frequencies. The main source of light would be sunlight. The scale of the wavelength and frequency for light determines the colour seen‚ as every colour has its own wavelength and frequency. When perceiving colour the spectrum of the wavelengths stretches from short wavelengths at 400nm to long wavelengths at 700nm (Fig. 4) . Within that range are many different colours
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practical was to measure the amount of a chemical substance present in a sample. Primarily‚ the aim of Experiment 1 was to measure the absorption spectrum of a particular coloured substance (in this case Bromophenol Blue and Methyl Orange) at varying wavelengths of light. For Experiment 2‚ the process of the experiment focuses on the substance and records its absorption levels at different concentrations. The absorption levels (A) that are obtained when samples of any given substance exposed to a source
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produced by the object. The actual frequency at which an object will vibrate at is determined by a variety of factors. Each of these factors will either affect the wavelength or the speed of the object. Since frequency = speed / wavelength‚ a chance in either speed or wavelength will result in an alternation of the natural frequency. The role of a musician is to control these variables in order to produce a given frequency from the
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1. Electromagnetic Waves Electromagnetic waves are composed of oscillating electric and magnetic fields at right angles to each other and both are perpendicular to the direction of propagation of the wave. Electromagnetic waves differ in wavelength. Fig1. Propagation of em wave In an electronegative wave the electric field E(vector) and the Magnetic field B(vector) oscillate perpendicular to each other and both are perpendicular to direction of propagation
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TRANSMISSION LINES Introductory Lecture Engr. Duwi E. Iscala SoE/APC What are transmission lines? • Transmission lines are pieces of wire or cable used to carry telephone signals‚ computer data in LANs‚ TV signals in cable TV systems‚ and signals from a transmitter to an antenna‚ or vice versa. Transmission Line • Definition: – Any means of conveying signal or power from one point to another What are the different types of transmission lines? • Parallel-wire lines What are the
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determine the wavelength of maximum absorption‚ Amax‚ of bromophenol blue. 2. To construct a standard concentration curve of bromophenol blue. 3. To determine the concentration of the unknown bromophenol blue solutions. 4. To determine the concentration of two different solutes‚ bromophenol blue and methyl orange in a mixture. Materials and Methods: Refer to Biological Science practical manual page 5-11. Results: Part 1: Determination of Amax of bromophenol blue The wavelength with maximum absorbance
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photosynthesis to occur and this is usually provided in the form of sunlight. All light‚ including sunlight‚ is a collection of wavelengths. The visible light spectrum contains wavelengths which vary in intensity from around 350nm (nanometres) to 750nm (Figure 1). Chlorophyll reflects green light (so leaves appear green) and absorb more blue and red light 4 . Figure 1: Wavelengths on the Visible Light Spectrum (Source Britannica.com) The
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Introduction At any particular wavelength the absorption of light when visible light passes through a solution depends on two factors: * The length of the light path * The concentration of the colored path The connection of these two variables is known as the Beer-Lambert Law: Absorbance (A) = ε c l Where ε is the absorption coefficient C is the concentration of the compound And l is the length of light usually 1cm When I is constant‚ this proves a linear relationship between
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cylinder and few of the dissolved Cobalt (II) Chloride Hexahydrate‚ was poured into test tube. The test tube was labeled with a tape‚ to signify 25 mL and the spectrophotometer was used to record the U-V visible ABS (absorbance spectrum) with the wavelength of 515. ● The 75 mL remaining solution was diluted with water‚ filling it to a 100 mL. Also‚ with a graduated cylinder 20 mL of these solution was measured and little was poured into a test tube. The test tube was labeled with a tape‚ to signify
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