# CFI Physics Vocab 3

 Electromagnetic waves waves that consist of oscillating electric and magnetic fields Index of refraction a number indicating the speed of light in a given medium as either the ratio of the speed of light in a vacum to that in the given medium absolute index of refraction or the ratio speed of light in a specified medium to that in the given medium relative index of refraction Linearly polarized the displacement of any point on the string from its equilibrium position is parallel to a line that makes an angle with x-axis Malus's law l=l0cos2, incident wave polarized, ideal polarized Refraction light rays that change direction as they cross the boundary between the two media Disperstion the speed of light in matter depends of frequency Critical angle the minimum angle of incident for which no light is transmitted past the boundary Bruster's angle the angle of incident for which the reflected light is totally polarized Focal point all rays parallel to the axis that are incident near the vertex are reflected by the convex mirror so they appear to originate from point F Mirror Equation 1/p+1/q=1/f Interference where waves from small number of sources travel different paths and arrive at an observer with different phases Diffraction The spreading of waves after they travel around obstacles or through apertures Principal of relativity the laws of physics are the same in all inertia frames Time dilation the time between tickds of the moving clock is dilated or expanded Light Year the distance light travels in 1 yr Quanta the energy emitted and absorbed by oscillating charges must only in discrete amounts Photoelectric effect which EM radiation incident on a mental surface causes electrons to be ejected from a metal Photon the quantum of EM radiation, that is, the smallest indivisible unit Ground state the orbit has the smallest possible radius and the lowest possible energy En= Mek2e4 = -2.18x10-182h2 Heisenberg uncertainthy principal describes the nature of indeterminacy. States there are limits to how precisely they can be simultaneously measured, even in an ideal experiment Quantum numbers set of four numbers. Specify it completely, no two electrons in the same atom can have the same four Atomic number the number of positive charges or portons in the nucleus of an atom of a given element Mass number the interger nearest in value to the atomic weight of an atom and equal number of nucleons in the nucleus of an atom Strong force one of the fundamental forces, along with gravity, electromagnetism, and the weak force Half life radioactive decay during which half of the nuclei decay Fission a large nuclear nucleus can therefore release energy by splitting into two smaller, more tightly blound nuclei Fusion combines two small nuclei to from a larger nucleus Quarks fundamental particles whose existence was proposed independently. Any of teh hypothetical particels with the spin 1/2, baryon number 1/3 and electric charge 1/3 or -2/3 that, together with their antiparticles, are believed to constitute all the elementary particles calssed as baryons and mesons, they are distinguished by their flavores, designated as up, down, starnge, charm, bottom, beauty, top or truth, and their colors red, green, and blue Exchange particle emitted by one particle and absorbed by another, it can transfer momentum and energy from one particle to another Radioactive decay Unstable nuclide that emits radiation AuthorBrettIRB ID67950 Card SetCFI Physics Vocab 3 DescriptionCFI Vocab 3 Updated2011-02-21T23:14:43Z Show Answers