1. The figure to the right shows an electron in a 1 dimensional box. What energy level is it in? A) 2.5 B) 3 C) 5 00000 D) 6 E) 7 . 2. A physics student observes a small fish in a very calm pond (full of water, n=1.33) from directly above. The image of the fish will appear: A) closer to the surface than it actually is B) Farther from the surface that it actually is C) The image and the object will be in the same location D) It depends upon how deep the water is
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- 2. When light with a wavelength of 218 nm is incident on a certain metal surface, electrons are ejected with a maximum kinetic energy of 3.34 x 1019 J. Determine the wavelength of light that should be used to double the maximum kinetic energy of the electrons ejected from this surface. nm4. What is the maximum acceleration potential (V) must be applied to electrons to cause electron diffraction on (220) planes of Lithium at 0 = 5°? (aLi = 3.517A°, m. = 9.1093837015 × 10' kg, q. = 1.6 × 10-19 coulomb, h = 6.62 x 10 34 J.S).4. MILLIKAN EXPERIMENT. An oil drop with a mass of 3.1 x10-1$kg absorbs 11 electrons, and then falls through an opening in two parallel, horizontal plates 1.8 cm apart. The upper plate is positive. a) Determine the charge absorbed by the oil drop. b) Determine the required potential difference between the plates in order for the oil drop to be suspended between the two plates.
- 19. A certain atom holds an electron with an initial energy of 6.4 eV above the ground state energy. At some time later the energy is 3.2 eV above ground state. What is the frequency associated with the emission of the photon for this transition? A. 9.4x10¹4 Hz B. 7.7x10¹4 Hz C. 2.1x10¹4 Hz D. 8.9x1014 Hz2. Assume now that an electron is not a point but a sphere of radius R over whose surface the electron charge is uniformly distributed. a) Find the total enery associated with the electric field built up by the "electron sphere". b) If you equate the total electric energy you get in a) with the rest mass energy of electron Eo mc², Calculate the value of R. = R is often called the classical radius of the electron.1a. One photon of light emitted from a hydrogen lamp is measured to have an energy of 0.6618eV. What electron transition is responsible for this photon? Hint: one of the energy levels involved is n = 3. 1b. What is the emission spectrum for a given element and why do different elements have different emission spectra?
- Question 14 a) A narrow beam of white light is passed through a clear glass vessel containing cool hydrogen gas at a low pressure. A prism is used to disperse the light leaving the vessel. This results in a white light spectrum, crossed by a series of dark lines. Explain the origin of these dark lines and name the type of spectrum that is produced. b) Some of the atomic energy levels of hydrogen are shown in the diagram below. i. ii. iii. Energy/eV 0 -0.85 -1.51 -3.39 -13.58 n = 4 n = 3 n = 2 n = 1 Determine the ionization energy of hydrogen and express this in joules. Determine the wavelength of the light emitted when an electron falls from the n = 3 level to the n = 1 energy level. A photon of energy 10.19 eV is in collision with a hydrogen atom. What would happen to this photon?If the intensity of a light source is increased while the frequency and the metal surface remain the same, which of the following will occur? a. Electrons will be emitted at an increased rate with more average energy per electron. b. Electrons will be emitted at the same rate with the same average energy per electron. c. Electrons will be emitted at the same rate but with less average energy per electron. d. Electrons will be emitted at the same rate but with more average energy per electron. e. Electrons will be emitted at an increased rate with the same average energy per electron.1. A magnesium surface has a work function of 3.10 eV. Electromagnetic waves with a wavelength of 190 nm strike the surface and eject electrons. Find the maximum kinetic energy of the ejected electrons. Express your answer in volts. f60 C £60* ssf60 sthetic oss 50 ssf60 s ssf60 ssf ectron
- What is the frequency of the emitted photon when an electron in a hydrogen atom jumps from n = 5 to n = 2 state? a) 2.30*106 Hz b) 6.91*1016 Hz c) 6.91*1014 Hz d) none of these.Electron microscopes allow us to see things that are smaller than we can see with optical microscopes because a.Electrons are smaller than photons b.The electrons have a shorter wavelength than visible light c.Electron microscopes operate in a vacuum while optical microscopes do not d.Electrons are larger than photons e.The electrons have a longer wavelength than visible lightAn electron jumps from the n = 4 to the n = 1 level in the hydrogen atom. In a second atom and electron jumps from n = 4 to n = 3. a. Which transition produces a photon with the larger energy? b. Which transition produces the shorter wavelength photon?