Chapter 2 - Chapter 2 Law of conservation of mass= mass is...

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Chapter 2 Law of conservation of mass= mass is nether created or destroyed Law of definite proportions=a given compound always contains exactly the same proportion of elements by mass Law of multiple proportions= when two elements form a series of compounds, the ratios of the masses of the second element that combine with 1 gram of the first element can always be reduced to small whole numbers Chapter 12 Wavelength= λ (lambda) this is the distance between two consecutive peaks or toughs in a wave Frequency=ν (nu) is the number of waves per second that passes a given point in space This all travels at the speed of light-Electromagnetic radiation Short wavelength has a high frequency and long wavelength has a low frequency Thus λν=c , where c= the speed of light which is 2.99792458x10 8 meters/second or 3x10 8 Wavelength is in meters and frequency is in cycles per second. Cycles per second is also called Hertz which is described as 1/s or s -1 Max Planck studied intensity v wavelength Blackbody radiation-idealized object that absorbs all the radiation incident on it, originates from the thermal energy of the body only and not does include radiation reflected from an object Ultraviolet catastrophe= a prediction that an ideal black body at thermal equilibrium will emit radiation with infinite power. Plack’s constant 6.626x10 -34 Js which is the change in energy for a system = ∆E= nh ν and n= a number 1, 2,3, h =6.626x10 -34 Js and v = the frequency of electromagnetic radiation is absorbed or emitted or λν=c Physicists always assumed that energy was continuous but this made it quantized (can put a number on it) Photons=stream of particles Einstein/ photoelectric effect-electrons are emitted from the surface area when the light strikes it and the number of electrons increases with the intensity of light. The threshold frequency is the kinetic energy of electrons that increase linearly with the frequency of light. Threshold frequency is the minimum energy to remove an electron which = E 0 = h ν 0 which means zero and can’t have any less than zero.
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This note was uploaded on 02/21/2010 for the course ENG W2018 taught by Professor Niccolas during the Spring '10 term at Columbia.

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Chapter 2 - Chapter 2 Law of conservation of mass= mass is...

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