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SECTION SUMMARY
5.3 Physics and the Quantum Mechanical Model Summary:
According to quantum mechanics, the motions of subatomic particles may be
described as waves. The wavelength and frequency of light are inversely
proportional to each other.
When atoms absorb energy, electrons move into higher energy levels. These
electrons then lose energy by emitting light when the electrons drop back to lower
energy levels.
The light emitted by an electron moving from a higher to a lower energy level has a
frequency directly proportional to the energy change of the electron. Passing this
emission through a prism gives the atomic emission spectrum of the element.
Classical mechanics adequately describe the motions of bodies much larger than
atoms, while quantum mechanics describes the motions of subatomic particles and
atoms as waves.
The quantum concepts developed from Planck’s studies of light radiation and
Einstein’s explanation of the photoelectric effect. Planck showed that the amount of
radiant energy absorbed or emitted by a body is proportional to the frequency of the
radiation.
5.3 Physics and the Quantu Mechanical Model Vocabulary Terms:
amplitude:
wavelength:
frequency:
hertz:
electromagnetic radiation:
spectrum:
atomic emission spectrum:
ground state:
photon:
the wave’s height from zero to the crest
the distance between the crest (  lambda)
the number of wave cycles to pass a given point per
unit of time ( nu)
the SI unit of cycles per second (unit of frequency)
includes radio waves, microwaves, infrared waves,
visible light, ultraviolet waves, X-rays, and gamma
rays
wavelengths of visible light that are separated when
a beam of light passes through a prism; range of
wavelengths of electromagnetic radiation
the pattern formed when light passes through a
prism or diffraction grating to separate it into the
different frequencies of light it contains
the lowest energy level of an electron
the quantum of light; a discrete bundle of
electromagnetic energy that interacts with matter
similarly to particles
Heisenberg uncertainty principle: principle states that it is impossible to know
exactly both the velocity and the positi9n of a
particle at the same time
The End of the Summary