frequencies and wavelengths. Frequency – the number of waves that pass a given point per second. Photoelectric effect – a phenomenon in which photoelectrons are emitted from a metals surface when light of a certain frequency shines on the surface. Photon - a particle of electromagnetic radiation with no mass that carries quantum of energy. Planck’s constant – 6.626 x 10 ^-34 J x s. Where j is the symbol for the joules. Quantum – the minimum amount of energy that can be gained or lost by an atom
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concept that: Richard Feynman‚ 1918 -1988 1965 Nobel Prize in Physics Forces are the result of the exchange of “force carriers” between the two particles involved in the interaction. The force carrier of the electromagnetic force is the photon Unification of the forces Two BIG questions: 1. W hen does gravity unify? 2. What breaks the Electroweak force? • Grand unified theories (GUTs) try to explain three of the forces in terms of a single consistent set of physical laws
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Abstract In this experiment‚ the absorbance of KMnO4 was measured by spectrophotometric method to determine the molar concentration and the molar extinction coefficient of KMnO4. In part 1‚ in order to determine the maximum absorbance wavelength of KMnO4‚ we measured the absorbance of the sample solution which contains KMnO4 at the wavelengths between 330nm and 660nm‚ and plotted the λ and A points; the λmax was 530nm. In part 2‚ the effect of concentration on the absorbance was examined. We prepared
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2. flight The response function flight of gsto to light is given in Equation 5 flight = 1 － exp((-Light_a) × PPFD) ‚ (5) where PPFD is the photosynthetic photon flux density (μmol m-2 s-1) and Light_a is the parameter. 3. ftemp The response function ftemp of gsto to air temperature is given after LRTAP (2010) as follows: ‚ for Tmin < T < Tmax (6) ftemp = fmin‚ for T ≥ Tmax or T ≤ Tmin‚ (7) where T is
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different types of forces in the Standard Model: electromagnetic force‚ the strong force‚ the weak force and gravity. The electromagnetic force explains electricity‚ magnetism‚ and other electromagnetic waves including light and it is carried by the photon. The strong force holds quarks together to make hadrons such as protons and neutrons. The weak force keeps atoms together to make bigger stuff. Nearly everything in the physical universe is made up of just three fermions‚ two types of quark and an
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the name ‘quantum’ to the tiniest mass of energy that can be absorbed in the figure of electromagnetic radiation (a kind of radiation including visible light‚ radio waves‚ gamma rays‚ and X-rays). The equation e=hf‚ is perhaps the equation of the photon theory of light (in
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Newton’s Laws of Motion and Gravity Define mass‚ weight‚ force‚ and acceleration. Mass – A measure of the total amount of material in a body‚ defined either by the inertial properties of the body or by its gravitational influence on other bodies. It is proportional to‚ but not the same as‚ its mass Force – A quantitative description of the interaction between two physical bodies‚ such as an object and its environment. Force is proportional to acceleration. Acceleration – A vector quantity that
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first post-Newtonian expansion‚ explaining the perihelion advance of Mercury‚ prediction of the deflection of light by gravity and gravitational lensing‚ the first fluctuation dissipation theorem which explained the Brownian movement of molecules‚ the photon theory and wave-particle duality‚ the quantum theory of
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Physics is a diverse area of study and in order to make sense of it scientists have been forced to focus their attention on one or two smaller areas of the discipline. This allows them to become experts in that narrow field‚ without getting bogged down in the sheer volume of knowledge that exists regarding the natural world. Below is a list - by no comprehensive - of different disciplines of physics. The list will be updated with new additions and definitions as appropriate. Acoustics - the study
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What is light produced‚ reflected and refracted into visible light? Refraction is the bending of a wave when it enters a medium where its speed is different. The refraction of light when it passes from a fast medium to a slow medium bends the light ray toward the normal to the boundary between the two media. The definition of produced visible light means when the electromagnets radiation meets the human eye. The first example of produced is a glow stick because it produces its own light . Another
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