containing the solution is placed in the spectrometer‚ which consists of a spectrograph and a photometer. The spectrograph produces light of selected wavelengths and is calibrated to indicate the color of the light it produces in terms of wavelength‚ usually expressed in nanometers. The photometer measures the intensity of the light beam at a given wavelength. The amount of light that is absorbed by the sample can be used to determine the amount of the colored species in solution according to the Beer-Lambert
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it‚ radio waves‚ microwaves‚ infrared waves‚ visible light‚ ultra violet‚ x-rays‚ and gamma waves. Radio waves~ are the electromagnetic waves with the wave length longer than 1mm‚ it is used for communication. Radio waves also have the longest wavelengths in the electromagnetic spectrum. These waves can be longer than a football field or as short as a football. Radio waves do more than just bring music to your radio. They also carry signals for your television and cellular phones. Because radio waves
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Spectrophotometry Introduction Spectrophotometry involves the use of a spectrophotometer. A spectrophotometer is a photometer (a device for measuring light intensity) that can measure intensity as a function of the color‚ or more specifically‚ the wavelength of light (nm). The instrument also can be use on biological sample such as chlorophyll pigments and suspended E.coli. Instrument Spectronic 20-Genesys 20 Materials i. Beaker ii. Burette iii. Glass rod iv. Volumetric
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Moles 1.How is molar mass calculated and why is it useful? You have to multiply the atomic weight of each element by the number of atoms that it contains in a compound. Molar mass is useful because its used to change a measurement of mass to an amount of a substance such as the number of particles. 2.Define a mole in chemistry and give 3 examples equivalent units that are used in chemical calculations. A mole measures the amount of a substance. Three examples that are equivalent to a mole is molar
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brain can process to create conscious sight. Many complex functions and deeper branches of vision are made possible by this process and others‚ color vision being just one of many. The brain allows organisms to perceive colors by sensing different wavelengths of light
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laser produces a coherent source of light with a narrow beam and a narrow spectral bandwidth (about 2cm). Lasers in fiber optics are usually solid-state semiconductor types. Lasers are used to provide the high-powered‚ tightly controlled light wavelengths necessary for high-speed‚ long-distance optical fiber transmissions. 4. Output Pattern – LED and laser semiconductors used in fiber-optic light sources are packaged to couple as much light as possible into the core of the optical fiber. The output
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of the light wave. According to Einstein and Planck‚ the energy of the packet could be expressed as the product of the frequency () of emitted light and Planck’s constant (h). E=h• When white light passes through a prism its component wavelengths are bent at different angles. This produces a rainbow of colors known as a continuous spectrum. If‚ however‚ the light emitted from hot gases or energized ions is viewed in a similar manner‚ isolated bands of color are observed. Each band represents
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+ 0.6(22) = 344.2 m/s 2. Wavelength = 4 x Length of Tube above Water λ = 4 x (0.32) = 1.28 m 3. Experimental Speed of Sound = Frequency x Wavelength v = 256 x 1.28 = 327.68 m/s 4. Accepted Value – Experimental Value x 100 = Percentage Error Accepted Value 344.2 – 327.68 x 100 = 4.9 % 344.2 5. Corrected Wavelength = 4(L + 0.4d) λ = 4(0.32 + 0.4(0.031)) = 1.3296 m 6. Corrected Speed of Sound = Frequency x Wavelength v = 256 x 1.3296 = 340.38
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The lamp experiment is primarily based off of the process of photosynthesis. The experiment tracks the rate of photosynthesis as it is affected by the color of the light source. Changing the light bulb color changes the length of the wavelengths that hit the chloroplasts in the plant leaves and effects how fast or if photosynthesis occurs. The equation for photosynthesis is 6 CO2 + 6H2O + light energy=C6H12O6 + 6O2 meaning that when a plant cell absorbs carbon dioxide and water alongside sunlight
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spectrometer are shown in the following diagram. The functioning of this instrument is relatively straightforward. A beam of light from a visible and/or UV light source (colored red) is separated into its component wavelengths by a prism or diffraction grating. Each monochromatic (single wavelength) beam in turn is split into two equal intensity beams by a half-mirrored device. One beam‚ the sample beam (colored magenta)‚ passes through a small transparent container (cuvette) containing a solution of the
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