P1 (50 points) : 1) The surface of the Sun has a temperature close to 6,000 K and
it emits a blackbody spectrum that reaches a maximum near 500 nm. For a body
with a surface temperature close to 300 K, at what waveleng
...
P1 (50 points) : 1) The surface of the Sun has a temperature close to 6,000 K and
it emits a blackbody spectrum that reaches a maximum near 500 nm. For a body
with a surface temperature close to 300 K, at what wavelength would the thermal
spectrum reach a maximum? (5 points)
A) 10 µm
B) 100 µm
C) 10 mm
D) 1 m
2) In the Rutherford’s experiment, what happened to the α particle when they are
incident on the thin gold foil? (4 points)
A) They all passed through the thin film.
B) They all scattered off with large angles.
C) Majority of them scattered off with large angles.
D) A small portion of them scattered off with large angles.
3) Which experiment best describes the wave natter of electrons? (4 points)
A) Oil drop experiment.
B) Thompson experiment.
C) The photoelectric effect
D) Blackbody radiation
E) The Davisson-Germer experiment
4) What is not the assumption that the Bohr model is based on? (4 points)
A) Stationary orbits exist, which have fixed energy without radiation.
B) Quantized angular momentum.
C) Atoms are made of lots of resonators, which emit energy by hf.
D) The electron moves in circular motion around the nucleus.
E) The force between the electron and the nucleus is provided by Coulomb force.
5) The work function for potassium is 2.24 eV. If potassium metal is illuminated
with light of wavelength 350 nm, find the maximum kinetic energy of the
photoelectrons: (5 points) (hc=1240 eV.nm)
A) 2.24 eV
B) 1.80 eV
C) 1.30 eV
D) 0.67 eV4
6) A particle in the n=3 state in an infinite square well. Please draw the
wavefunction of it (5 points) and the probability (5 points) to find the particle in
this well.
7) Consider a particle in a square well with infinite sides of width L. What is the
wavelength of a photon needed to excite the particle from the ground state to the
2nd excitation state? (8 points)
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