flowers‚ fruit and vegetables. These have a function in reproduction. Figure 4: Malvidin present in grapes (http://www.friedli.com/herbs/phytochem/anthocyanins.gif) The Visible Spectrum The mixture of chlorophyll found in spinach absorbs many wavelengths of the visible light. The absorbance peaks ranges 400 – 500nm is the blue range and 600 -700 nm the yellow- red range. The two principles of this light absorption stated (Practical Skills in Chemistry‚ 2011) are: 1) the absorption of light is
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day with respect to distant stars Synodic - with respect to another object‚ e.g. length of day with respect to Sun Doppler Effect - change in wavelength due to moving toward or away from observer; with sound lower pitch means moving away‚ higher pitch means moving toward; with light red shift (longer wavelength) means moving away‚ blue shift (shorter wavelength) means moving toward Spin-Orbit Resonance - when rotation and orbit of an object around another body is in a simple ratio; caused by tidal dissipation;
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examined with a spectroscope and compared to light from the same elements on Earth‚ the spectrum from the star or galaxy shows a shift towards the red end of the spectrum. * A red shift corresponds to a shift to the lower frequency (longer wavelength). This indicates that the light source‚ the galaxy is moving away from us. All galaxies show this effect indicating that the universe is expanding. The stretching of space causes the cosmological red shift. Describe the transformation of radiation
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knowledge of one fourth wavelength to create our own demonstration. It does not only have to be done using wind‚ but can also be demonstrated using tuning forks. If the frequency of the tuning forks is known‚ then v=f(wavelength) can find you the length of your air column. Using a tuning fork of frequency 512 c/s‚ and the speed of sound is 332+0.6T m/s‚ temperature being‚ 22 degrees‚ substitute into the formula. Calculate 1/4 wavelength V=f(wavelength) wavelength=V/f
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use the Beer-Lambert law to explain the relationship linking concentration and absorbance of the coloured solutions methyl orange and bromophenol blue. • To be able to rightly operate a spectrophotometer to assess the absorbance at various wavelengths • To be able to identify the main component parts of a spectrophotometer • To be able to draw a ‘Standard Curve’ from the data collected • To be able to calculate the ‘percentage absorption coefficient’ for the solutions methyl
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Observing Flames and Specs through a Spectroscope By: Seif Alkhouri Cristian Plancia-Mata Charlotte Maxwell Suryansh Kumar Evan Hatton J. Immel Ph.D Introduction Spectroscopy is the study of the interaction between matter and radiated energy. English philosopher Roger Bacon(1214-1294) was the first person to recognize that if sunlight passes through water it splits into colors. Around four centuries ago‚ Isaac Newton originated the title “spectrum” to label the shade of rainbows put
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Planck’s constant after Max Planck‚ the German scientist who first proposed it. Planck’s constant has a value of 6.63 X 10-34 J. s . Frequency is measured in units of 1/s or Hertz (Hz). The frequency of a light wave is inversely proportional to its wavelength‚ λ‚ (λ is
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FIBER-OPTIC COMMUNICATION Introduction Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fiber. The light forms an electromagnetic waves that is modulated to carry information. First developed in the 1970s‚ fiber-optic communication system have revolutionized the telecommunication industry and have played a major role in the advent of the information over age. Because of its advantages over electrical
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collected from the monastery of Saint Anthony in Egypt. The origins of the monastery are due to the 4th century AD. FTIR–ATR spectra were collected on a Perkin Elmer spectrometer 400 equipped with an ATR detector (attenuated total reflectance) in the wavelength range of 4000–650 cm–1‚ at a spectral resolution of 4 cm–1 over 32 scans. In attenuated total reflectance (ATR) spectroscopy‚ the sample is placed in contact with a special crystal (e.g.‚ zinc selenide‚ ZnSe). Figure 6 shows FTIR–ATR spectrum of
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In our lab‚ we were given the task of burning seven different salts and taking notes of what we observed. The different salts included Potassium chloride‚ Calcium chloride‚ Strontium chloride‚ Lithium chloride‚ Copper II chloride‚ Sodium Chloride‚ and Barium Chloride. Burning a pinch of each salt separately by holding a nichrome wire over a Bunsen burner‚ we found that each salt emitted a different color of light. For example‚ Potassium Chloride burnt a bright pink flame when burned‚ while Calcium
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