CFI Physics Vocab 3

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CFI Physics Vocab 3
2011-02-21 18:14:43
Physics Vocab

CFI Vocab 3
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  1. Electromagnetic waves
    waves that consist of oscillating electric and magnetic fields
  2. 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
  3. 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
  4. Malus's law
    l=l0cos2, incident wave polarized, ideal polarized
  5. Refraction
    light rays that change direction as they cross the boundary between the two media
  6. Disperstion
    the speed of light in matter depends of frequency
  7. Critical angle
    the minimum angle of incident for which no light is transmitted past the boundary
  8. Bruster's angle
    the angle of incident for which the reflected light is totally polarized
  9. 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
  10. Mirror Equation
  11. Interference
    where waves from small number of sources travel different paths and arrive at an observer with different phases
  12. Diffraction
    The spreading of waves after they travel around obstacles or through apertures
  13. Principal of relativity
    the laws of physics are the same in all inertia frames
  14. Time dilation
    the time between tickds of the moving clock is dilated or expanded
  15. Light Year
    the distance light travels in 1 yr
  16. Quanta
    the energy emitted and absorbed by oscillating charges must only in discrete amounts
  17. Photoelectric effect
    which EM radiation incident on a mental surface causes electrons to be ejected from a metal
  18. Photon
    the quantum of EM radiation, that is, the smallest indivisible unit
  19. Ground state
    the orbit has the smallest possible radius and the lowest possible energy
  20. En=
    • Mek2e4 = -2.18x10-18
    • 2h2
  21. 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
  22. Quantum numbers
    set of four numbers. Specify it completely, no two electrons in the same atom can have the same four
  23. Atomic number
    the number of positive charges or portons in the nucleus of an atom of a given element
  24. 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
  25. Strong force
    one of the fundamental forces, along with gravity, electromagnetism, and the weak force
  26. Half life
    radioactive decay during which half of the nuclei decay
  27. Fission
    a large nuclear nucleus can therefore release energy by splitting into two smaller, more tightly blound nuclei
  28. Fusion
    combines two small nuclei to from a larger nucleus
  29. 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
  30. Exchange particle
    emitted by one particle and absorbed by another, it can transfer momentum and energy from one particle to another
  31. Radioactive decay
    Unstable nuclide that emits radiation