Waves, Quantum Theory, and Photons

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Created by
Jade

Cards (23)

  • Wave - a vibrating disturbance through which energy is transmitted
  • Parts of Wave
    A) Crest
    B) Amplitude
    C) Rest Position
    D) Wavelength
    E) Trough
  • Wavelength - length of the wave from crest to crest or trough to trough
  • Crest - top of the wave
  • Frequency - number of waves that pass through one specific point
  • Trough -bottom of the wave
  • Amplitude - Vertical distance from the middle of the wave to the crest or trough
  • Angstroms - a unit of length equal to 10^-10 meter or one-hundred millionth of a centimeter
  • Electromagnetic Spectrum - the collection of all types of electromagnetic radiation
  • The Electromagnetic Spectrum
    A) Radio
    B) Microwave
    C) Infrared
    D) Ultraviolet
    E) X-ray
    F) Gamma ray
  • Max Planck - German physicist who discovered that electrons can also act like particles, because when they hit a metal surface they emit electrons
  • Quantum - the smallest quantity of energy that can be emitted or absorbed in the form of EM energy
  • Max Planck heated solids until they glowed red hot and then observed that they emitted EM radiation. He found that EM radiation was emitted in small packages called QUANTA (singular: quantum)
  • Joule - an SI unit for energy
  • Lambda - wavelength
  • Quantum Theory - the study of matter and energy on the atomic and subatomic levels
  • Quantum Theory - allows scientists to understand how electrons behave and to make predictions
  • Albert Einstein - a German physicist who developed the theory of relativity. He was awarded the Nobel Prize in Physics in 1921 for his discovery of the law of Photoelectric effect
  • Einstein shot a beam of light onto a metal surface, which caused electrons to be emitted. This emission is called the PHOTOELECTRIC EFFECT
  • Einstein found the number of electrons that were ejected from the metal was proportional to the brightness of the light
  • The energy of light must be above a certain frequency (called the THRESHOLD FREQUENCY) for electrons to be ejected.
  • Einstein suggested that the beam of light that could eject an electron was a particle of light called a PROTON
  • A photon = quantum
    1. They are neutral and have no mass
    2. They interact with electrons and have energy and speed that is dependent on their frequency
    3. They can travel at the speed of light, but only in a speed of light, such as space
    4. All light and EM energy are made up of photons