All green parts of a plant have chloroplasts. However‚ the leaves are the major site of photosynthesis for most plants. There are about half a million chloroplasts per square millimeter of leaf surface. The color of a leaf comes from chlorophyll‚ the green pigment in the chloroplasts. Chlorophyll plays an important role in the absorption of light energy during photosynthesis. Chloroplasts are found mainly in mesophyll cells forming the tissues in the interior of the leaf. O2 exits and CO2 enters
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It is really a mixture of all the different colours of light. The colours range from violet‚ indigo‚ and blue‚ to green‚ yellow‚ orange‚ and red. These make up the visible part of the electromagnetic spectrum. Light is made up of particles‚ called PHOTONS‚ which 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
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Kinetic Energy: Consider a baseball flying through the air. The ball is said to have "kinetic energy" by virtue of the fact that its in motion relative to the ground. You can see that it is has energy because it can do "work" on an object on the ground if it collides with it (either by pushing on it and/or damaging it during the collision). The formula for Kinetic energy‚ and for some of the other forms of energy described in this section will‚ is given in a later section of this primer. Potential
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beams from one "telescope" to another using low power infrared laser in the terahertz spectrum. The beams of light in Free Space Optics (FSO) systems are transmitted by laser light focused on highly sensitive photon detector receivers. These receivers are telescopic lenses able to collect the photon stream and transmit digital data containing a mix of Internet messages‚ video images‚ radio signals or computer files. Commercially available systems offer capacities in the range of 100 Mbps to 2.5 Gbps‚
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Física da Radiação‚ 1º semestre‚ IST‚ 2010/2011 1 Radiopharmacology Radiopharmacology Diogo Ferreira‚ diogo.cunha.ferreira123@gmail.com MSc student in Biomedical Engineering‚ Instituto Superior Técnico‚ student no58548 Abstract Nuclear Medicine is the branch of medicine concerned with the use of radio-nuclides in the study and the diagnosis of diseases‚ eg. the assessment of organ function‚ detection and treatment of some diseases or monitoring of treatment’s effects. It provides physiological
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plants and animals they eat‚ they also release energy stored by photosynthesis. Scientists have learned through experimentation that light behaves like a particle at times and like a wave at other times. The particle-like features are called photons. Photons are different from particles of matter in that they have no mass and always move at the constant speed of about 300‚000 km/sec (186‚000 mi/sec) when they are in a vacuum. When light diffracts‚ or bends slightly as it passes around a corner‚ it
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include the same ideas as the predestination paradox‚ but it would also prevent the continuation of time. In a quantum physics experiment using polarized photon pairs‚ physicists sent one photon of the pair into a closed time like curve simulator. When the photon emerged‚ it was still the same as its twin 100 percent of the time. Since the second photon acts just as the first‚ the grandfather must not be affected in order to maintain the same characteristics as its partner. This would show that if you
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the ground floor and this sequence continued. What has happened here is called “ spontanious decay”. This mean sthat even when an electron gets excited by a photon and is ruptured up to the top‚ it will slowly and always come right back down the way it came. But in this case they are considered virtual photons. They are called Virtual photons as just a theory.(Gilmore pg
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pond. Like this‚ light is said to have wave property. Also‚ light is the flow of particles called a photon. Shading by putting an object on the shining spot is due to blocking of the flow of particles by this subject. This is synonymous with that the energy of photon is small or big from the concept of photon. In other words‚ the shorter the wave length of light is the bigger the energy of photon is. Light can be understood as dual concept of
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the inelastic scattering of a photon. When light is scattered from an atom or molecule‚ most photons are elastically scattered (Rayleigh scattering). The scattered photons have the same energy (frequency) and‚ therefore‚ wavelength‚ as the incident photons. However‚ a small fraction of scattered light (approximately 1 in 10 million photons) is scattered from excitations with optical frequencies different from‚ and usually lower than‚ the frequency of the incident photons. Raman effect is helpful in
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