1st midterm phy 17Physics 17

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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) [Show More]

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