CP Workbook
The Atom and the Quantum
To say that light is quantized means that light is made up of
elemental units
waves
Compared to photons of low-frequency light, photons of higher-frequency light have more
energy
speed
quanta
The
photoelectric effect
supports the
wave model of light
particle model of light
The photoelectric effect is evident when light shone on certain photosensitive materials ejects
photons
electrons
The photoelectric effect is more effective with violet light than with red light because the photons of violet light
resonate with the atoms in the material
deliver more energy per photon to the material
are more numerous
According to
deBroglie's wave model
of matter a beam of light and a beam of electrons
are fundamentally different
are similar
According to deBroglie, the greater the speed of an electron beam, the
greater is its wavelength
shorter is its wavelength
The
discreteness of the energy levels of electrons
about the atomic nucleus is best understood by considering the electron to be a
wave
particle
Heavier atoms are not appreciably larger in size than lighter atoms. The main reason for this is because the greater nuclear charge
pulls surrounding electrons into tighter orbits
holds more electrons about the atomic nucleus
produces a denser atomic structure
Whereas in the everyday macro-world the study of motion is called mechanics, in the micro-world the study of quanta is called
Newtonian mechanics
Quantum mechanics
Paul G. Hewitt
Copyright © 1984-2005
All rights reserved.
Used with written
permission.
PhysicsLAB
HTML conversion
Copyright © 1997-2025
Catharine H. Colwell
All rights reserved.
Mainland High School
Daytona Beach, FL 32114