Consider short wavelength plane waves incident upon a barrier with a relatively large opening. After passing through the opening, the waves
continue as plane waves
Laser light is directed at two closely-spaced slits. The distance from the first slit to a given point on the screen is exactly 2 1/2 wavelengths, and the distance from the second slit to the same point on the screen is exactly 5 wavelengths. The light fr
a dark fringe
The bright and dark fringes produced when light shines through two closely spaced slits are a result of
interference
For radio reception, diffraction is
helpful
According the Huygens principle, every point on a wave
behaves as a source of new waves
Some double-pane airplane windows darken when the inner pane is rotated. The panes are
polaroid filters
which of the following is a property of lightwaves, but not of sound waves
polarization
Magenta is seen at one place on a soap bubble film. At a slightly thicker region of the film, one would likely see the color
cyan
Colors seen when gasoline forms a thin film on water are a demonstration of
interference
Light will pass through a pair of polaroids when their axes are
parallel or 45 degrees to each other (either of these)
The radiation curve for a "red-hot" object peaks in the
infrared region
a throbbing pulse of electromagnetic radiation is called a
photon
a violet-hot star emits radiation having about twice the peak frequency of radiation from a red-hot star. The surface temperature of the hotter star is about
twice that of the cooler star
An atom that absorbs a certain amount of energy can then emit
a photon of the same or lower energy
light is emitted when an electron
makes a transition to a lower energy level
An atom that emits a certain frequency of light is
An absorber of the same frequency
Light from a laser is
coherent, in phase, monochromatic (all of these)
The fact that iron absorption lines occur in the solar spectrum directly indicates that there is iron in the solar
atmosphere
Which light-emitting process is characterized by an afterglow
phosphorescence
In the process of fluorescence, the input is high-frequency light an the output is
lower-frequency light
In the photoelectric effect, the greater the frequency of the illuminating light, the greater the
maximum velocity of the ejected electrons
The more information one has about the energy of an electron, the less certain one is about
The time it has that energy
Which of the following photons has the greatest energy
ultraviolet
When traveling from one place to another, light behaves as a ________, and when interacting with matter, light behaves as a _________.
wave; particle
If a proton and an electron have identical momenta, the longer wavelength belongs to the
proton, electron (both the same)
The quantum-mechanical probability cloud for the electron in the hydrogen atom has an average radius
that agrees with the orbital radius of Bohr
The main reason electrons occupy discrete orbits in an atom is because
the circumference of each orbit is an integral multiple of electron wavelengths
The Schrodinger equation is most useful for describing
submicroscopic particles.
we now consider the Bohr model of the atom to be
defective and oversimplified, but still useful
A hypothetical atom has five distinct energy states. Assuming all transitions are possible, how many special lines can this atom produces?
6