MIDTERM 1 REVIEW
WAVES:
Given that yellow light is about 600
nm and blue light is 500 nm,
Which has the higher frequency?
Higher energy?
BLACK BODY RADIATION
Graphical Reasoning/Synthesis questions
Given the graphs: Which would you expect to look “whiter” to the human eye, a
lightbulb operating at 3300K or 2700K? Why or why not?
Synthesis: Would a light bulb operating at 5000K (assume it were possible to
engineer this) be an efficient light source? Why or why not?
Our sun’s lmax is approximately 500nm. This is squarely in the green region of the
electromagnetic spectrum. So is the sun green? Why or why not?
The picture below shows water interfering in a way similar to how light
interfered in the double slit experiment.
• Which letter(s) represents the area where the waves are interfering
constructively?
• Which letter(s) represents the area where waves are interfering
deconstructive?
• If instead of water, this was light, which letter(s) would give rise to a
bright spot on the film?
WAVE
INTERFERENCE
• If instead of water, this was light, which letter(s) would give rise to a
dim spot on the film?
Photoelectric Effect
You are doing an experiment replicating the
photoelectric effect on two different metals. One has a
work function of 5.90x10-19J, and one has a work
function of 3.00x10-19J.
Which has a greater threshold frequency?
If a laser of sufficient energy to eject electrons from either metal is used. And a pulse with the same number of photons is
shown on each metal, which metal will eject more electrons?
If a laser of sufficient energy to eject electrons from either metal is used. And a pulse with the same number of photons is
shown on each metal, which metal will eject electrons at a faster velocity?
Heisenberg
Uncertainty Principle
• True or False: The Heisenberg Uncertainty principle does not allow you to know both
momentum and position at the same time?
• True or False: The Heisenberg Uncertainty principle is due to error in our measurements?
• True or False: The Heisenberg Uncertainty principle is only true for matter?
DeBroglie Wavelength
• Which has a longer wavelength, a proton or an electron? (don’t do
calculations)
• Can this equation be used to find the wavelength of light? How do you
know? Which equations should you use?
• Why don’t we see the wavelength of large objects?