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Stack #529122
Ch 4.1 The Development of a New Atomic Model
Question | Answer |
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Electromagnetic Radiation | the radiation associated with an electric and magnetic field; it varies periodically and travels at the speed of light. |
Electromagnetic Spectrum | all the frequencies or wavelenghts of electromagnetic radiation. |
Wavelength | the distance from any point on a wave to an identical point on the next wave. |
Frequency | the number of cycles or vibrations per unit of time; also the number of waves produced in a given amount of time. |
Photoelectric Effect | the emission of electrons from a material when light of certain frequencies shines on the surface of the material. |
Quantum | the basic unit of electromagnetic energy; it characterizes the wave properties of electrons. |
Photon | a unit or quantum of light; a particle of electromagnetic radiation that has zero rest mass and carries a quantum of energy |
Ground state | the lowest energy state of a quantized system. |
Excited State | a state in which an atom has more energy than it does at its ground state. |
Line-emission spectrum | a diagram or graph that indicates the degree to which a substance emits radiant energy with respect to wavelength. |
Continuous spectrum | the uninterrupted broad band of all colors (wavelengths)emitted by incandescent solids. |