Quantum Mechanics Exam Questions and Answers
Which has more energy, a photon of: - Answer-Red Light
If the cuttoff frequency for light in the photoelectric effect for metal B is greater than that of metal A. Which metal has a greater work function (binding energy)? - Answer-Metal B
A metal ...
Which has more energy, a photon of: - Answer-Red Light
If the cuttoff frequency for light in the photoelectric effect for metal B is greater than that
of metal A. Which metal has a greater work function (binding energy)? - Answer-Metal B
A metal surface is struck with light of λ= 400 nm, releasing a stream of electrons. If the
400 nm light is replaced by λ= 300 nm light of the same intensity, what is the result? -
Answer-Emitted electrons are more energetic
A metal surface is struck with light of λ= 400 nm, releasing a stream of electrons. If the
light intensity is increased (without changing λ), what is the result? - Answer-More
electrons are emitted in a given time interval
A photocell is illuminated with light with a frequency above the cutoff frequency. The
magnitude of the current produced depends on: - Answer-Intensity of the light
The speed of proton A is larger than the speed of proton B. Which one has the longer
wavelength? - Answer-Proton B
An electron and a proton have the same speed. Which has the longer wavelength? -
Answer-Electron
An electron and a proton have the same momentum. Which has the longer wavelength?
- Answer-Same
For the possible transitions shown, for which transition will the electron gain the most
energy? - Answer-E2-E5
The Balmer series for hydrogen can be observed in the visible part of the spectrum.
Which transition leads to the reddest line in the spectrum? - Answer-E3-E2 (Longest
Wavelength)
Suppose there is an atom that contains exactly five energy levels. How many different
transitions are possible? (Count only one direction!) - Answer-10
Suppose the Rutherford model was correct (instead of the Bohr model). What would the
absorption spectrum of a hydrogen atom look like? - Answer-It would be completely
black
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