Color fills our world with beauty. We delight in the colors of a magnificent sunset and in the bright red and golden-yellow leaves of autumn. We are charmed by gorgeous flowering plants and the brilliantly colored arch of a rainbow. We also use color in various ways to add pleasure and interest to our lives. For example‚ many people choose the colors of their clothes carefully and decorate their homes with colors that create beautiful‚ restful‚ or exciting effects. By their selection and arrangement
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pigments. Colors in the wavelengths are either absorbed or reflected by the chlorophyll in which case green is reflected and colors like red and blue are seemed to be absorbed. If blue and red wavelengths have more absorbance‚ the green doesn’t have a high absorbance. This lab is useful to help demonstrate the existence of various leaf pigments by using the process of paper chromatography.
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and so form a spectrum. The colours of light are distinguished by their different wavelengths. The visible part of the spectrum ranges from red light with a wavelength of about 720 nm‚ to violet with a wavelength of about 380 nm‚ with orange‚ yellow‚ green‚ blue and indigo between. The three different types of colour receptors in the retina of the human eye respond most strongly to red‚ green and blue wavelengths‚ giving us our colour vision. Tyndall Effect The first steps towards correctly
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in the medium. [pic] By definition‚ n = 1 in vacuum. In all materials n > 1. The frequency of light does not change as it goes from one a medium of one index of refraction to another. This means that the wavelength changes with the speed. [pic] Thus‚ the wavelength is smaller in a medium than in vacuum. From the definition of the index of refraction‚ we can rewrite the relationship between the incident and refracted angles as Or [pic] This equation is known as Snell’s
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remote-control circuits‚ such as those in remote controls for a wide variety of consumer electronics. The first visible-light LEDs were also of low intensity‚ and limited to red. Modern LEDs are available across the visible‚ ultraviolet‚ and infrared wavelengths‚ with very high brightness. Laser Transmitter A laser transmitter projects a beam of laser light outward while raising and lowering the beam. The beam may define a conical surface of varying inclination. The transmitter includes a laser source
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In experiment 3.1.We set up and calibrate the spectronic 20 first since it takes time to be ready to use so‚ we turned the spectronic 20 to warm up for at least 15 minutes‚ set wavelength to 360 while no test tube in it. Also‚ we set the filter lever in order to match the wavelength range‚ and then set the transmittance to 0%‚ then we changed the mode to absorbance. After we labeled two test tubes which were #5 and #10‚ we inserted water first to set 0 absorbance‚ then we used #5 sample to read it
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spectrum extends from below the low frequencies used for modern radio‚ to gamma radiation at the short-wavelength (or high-frequency) end‚ therefore covering wavelength for thousands of miles long down to wavelengths a fraction the size of atom. There is no set limit for the length of a wavelength so scientists define it as the size of the universe itself (which is pretty big…) while the short wavelength limit is in the vicinity of the Planck length (denoted ℓP‚ is a unit of length‚ equal to 1.616199(97)×10−35
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Solar Energy Solar energy in one form or another is the source of nearly all energy on the earth. Humans‚ like all other animals and plants‚ rely on the sun for warmth and food. However‚ people also harness the sun’s energy in many other different ways. For example‚ fossil fuels‚ plant matter from a past geological age‚ is used for transportation and electricity generation and is essentially just stored solar energy from millions of years ago. Similarly‚ biomass converts the sun’s energy into a
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1. Wavelength of short ultraviolet radiation is: A. 700-1500 mµ B. 1600-12‚000 mµ C. 0.1-3 mm D. 180-290 mµ 2. Wavelength of long ultraviolet radiation is: A. 700-1500 mµ B. 290-400 mµ C. 180-290 mµ D. 0.1-3 mm 3. What ultraviolet wavelength will produce reticuloendothelial stimulation? A. 2600-2700 Å B. 2700-3000 Å C. 2900-4000 Å D. 2400-2500 Å 4. The magnitude of radiation flux at any particular point of the skin depends upon the: A. Cross-sectional diameter of the
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oxygen (O2) molecules. There are two stages to this process; light reactions and dark reactions. Light reactions start with chloroplast which absorbs the light. Inside the chloroplast are thylakoids that contain pigments which absorb certain wavelengths of light. Each cluster of pigments is called a photosystem. Photosystem I and II obtain some of the light’s energy. Light first enters chlorophyll A in photosystem II and the electrons inside become excited enough to leave it. Some of the electrons
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