Slide 1 / 43 Slide 2 / 43 1 The “Cathode Ray Tube” experiment is associated with: A J.J. Tomson B J.S. Townsend AP Physics 2 C M. Plank D A.H.Compton Quantum Physics and Atomic Models Multiple Choice www.njctl.org Slide 3 / 43 Slide 4 / 43 2 The electron charge was measured the first time in: 3 What is the difference between cathode rays and X-rays? A Cathode ray experiment A Both rays are made up of particles B Photoelectric effect experiment B Both rays are different types of electromagnetic radiation C Oil drop experiment C Cathode rays are particles and X-rays are electromagnetic radiation D Compton effect experiment D Cathode rays are electromagnetic radiation and X-rays are particles Slide 5 / 43 Slide 6 / 43 4 What distinctive phenomena are illustrated in X-ray spectra? 5 Which of the following colors indicates an object of the lowest (Select 2 answers) temperature? A Bremsstrahlung - deceleration of the electrons striking the A Violet anode B Blue B Acceleration of the electrons after they strike the anode C Yellow C Internal atomic structure of the anode D Red D Cathode ray penetration power
Slide 7 / 43 Slide 8 / 43 6 Which is a property of a black body radiator? 7 Which of the following photons has the greatest energy? A It absorbs all incident radiation, then re-emits it at a A Infrared frequencies determined by its temperature. B Blue B It is always black, even when heated to high temperatures. C γ- photon C It absorbs all incident radiation and does not re-emit any radiation D ultraviolet-photon D As it is heated, it changes color from black to blue to red Slide 9 / 43 Slide 10 / 43 8 What discrepancy between experiment and theory helped lead 9 The energy of a photon depends on: Max Planck to his quantum theory? A Amplitude A The discovery of Cathode Rays B Speed B The discovery of X-Rays C Temperature C The Ultraviolet Catastrophe D Frequency D The discovery of electrons Slide 11 / 43 Slide 12 / 43 10 How does the energy of a photon change if the wavelength is 11 How does the momentum of a photon change if the wavelength is doubled? halved? A Energy doubles A Doubles B Energy quadruples B Quadruples C Energy stays the same C Stays the same D Energy is halved D Is cut to one-half
Slide 13 / 43 Slide 14 / 43 12 The photoelectric effect explains: 13 The kinetic energy of photo-electrons depends on (Select 2 answers): A The wave nature of light A Angle of illumination B The particle nature of light B Intensity of light C The wave properties of an electron C Work function D The atomic structure D Wavelength of light Slide 15 / 43 Slide 16 / 43 14 Which of the following is the formula of the photon momentum? 15 The stopping potential of photo-electrons depends on which of the following… (Select 2 answers) A p = hf/c A The light intensity B p = cλ/h B The frequency of the photons C p = hc/f C The composition of the metal surface D p = E/mc D The speed of the incoming photons Slide 17 / 43 Slide 18 / 43 16 Which of the following formulas expresses the photoelectric effect? 17 Which of the following graphs correctly relates the maximum kinetic energy of photo-electrons and the frequency of the incident light? A hλ = W0 + KE B B hf = W0 - KE A C hf = W0 + KE D hλ = -W0 + KE D C
Slide 19 / 43 Slide 20 / 43 18 Which of the following graphs correctly relates the maximum 19 Which of the following graphs correctly relates the de Broglie kinetic energy of photo-electrons and the intensity of the incident wavelength and the linear momentum of a particle? light? B A B A D C D C Slide 21 / 43 Slide 22 / 43 20 All of the following are properties of γ-rays EXCEPT: 21 Which of the following phenomena provides the best evidence that light can have particle properties? A They discharge electrified objects A Diffraction of light B They ionize gases B Compton scattering C They are deflected by magnetic fields C Electron diffraction D They penetrate objects D γ-ray diffraction Slide 23 / 43 Slide 24 / 43 22 Which of the following phenomena provides the best evidence that 23 Which of the following formulas can be used to determine the de particles can have wave properties? Broglie wavelength? A The absorption of photons by electrons in an atom A λ = hmv B The interference pattern produced by neutrons incident on a B λ = h/mv crystal C λ = mv/h C The production of x-rays by electrons striking a metal target D λ = mc/h D Compton scattering
Slide 25 / 43 Slide 26 / 43 24 A photon can disappear producing an electron and positron. What 25 When a proton collides with an antiproton they disappear is this phenomenon called? producing photons. This phenomenon is called… A X-Rays diffraction A X-Rays diffraction B Electron scattering B Electron scattering C Annihilation C Annihilation D Pair production D Pair production Slide 27 / 43 Slide 28 / 43 26 The following statement: “In order to understand a given 27 Electrons are accelerated to a maximum speed of v in an X-Ray experiment, we must use either the wave or particle theory, but not tube by an applied voltage V0. What is the maximum speed of the both” is called? electrons if the voltage is quadrupled? A Wave theory of light A 4 v B Particle theory of light B 2 v C Principle of complementarity C √(2)v D Wave theory of matter D v/4 Slide 29 / 43 Slide 30 / 43 28 In a Compton Effect experiment a photon scattered from an 29 If all of the following objects move at the same speed, which one electron at rest increases its wavelength. Which of the following will have the greatest deBroglie wavelength? deflection angles θ provides the greatest increase in the wavelength of the scattered photon? A Neutron A 0 ο B Electron B 60 ο C Bowling ball C 90 ο D α- Particle D 180 ο
Slide 31 / 43 Slide 32 / 43 30 Rutherford’s “Scattering α-particles by a gold foil” experiment 31 In Rutherford’s experiment, most of α - particles pass through the disproved which of the following: foil without deflection. Which of the following properties of the atom can be explained by this observation? (Select 2 answers) A Plum-pudding model of the atom A An atom’s positive charge is concentrated in the nucleus B Planetary model of the atom B The nucleus is made up neutrons and protons C De Broglie hypothesis C Electrons move around the nucleus in orbits of quantized energy and angular momentum D Wave nature of light D An atom is mostly empty space Slide 33 / 43 Slide 34 / 43 32 Which of the following statement(s) can be associated with Bohr’s 33 When an electron falls from an orbit the first excited state (n=2) to theory of the atom? (Select 2 answers) the ground state (n=1): A An electron orbiting the nucleus can change its energy A A photon is emitted continuously B A photon is absorbed B An electron orbiting the nucleus emits energy and falls on the nucleus C No photons are involved C An electron can change its energy only by a certain portion D An electron is emitted when it jumps between the orbits D The angular momentum of an electron around the nucleus is equal an integer times h/2π Slide 35 / 43 Slide 36 / 43 34 In the Bohr model, when an electron jumps from the n = 1 orbit (of 35 In the Bohr model, when an electron jumps from the n = 1 orbit (of radius r 1 ) to the n = 3 orbit, what is its new orbital radius as a energy E 1 ) to the n = 4 orbit, what is its new energy as a proportion proportion of r 1 ? of E 1 ? A r 1 /9 A E 1 /9 B r 1 /3 B E 1 /16 C 3 r 1 C 4 E 1 D 9 r 1 D 16 E 1
Slide 37 / 43 Slide 38 / 43 36 In the Bohr model, when an electron orbits a single proton in the n 37 An electron accelerated from rest by a 600V potential difference = 5 state, how many deBroglie wavelengths fit onto the has a De Broglie wavelength of λ. What would the electron’s De circumference of this orbit? Broglie wavelength be if the potential difference had been 150 V? A 3 A 2 λ B 4 B λ /2 C 5 C λ /4 D 6 D 4 λ Slide 39 / 43 Slide 40 / 43 38 According to Maxwell’s theory of electromagnetism, an electron 39 A hypothetical atom has energy levels as shown by the graph orbiting a nucleus must: (right). An electron is excited from the ground state to the -1 eV energy level. Which of the following are the energies of the emitted photons? (Select 2 answers) A Change its energy in quantized amounts A 2 eV B Conserve its angular momentum B 4 eV C Conserve its energy C 10 eV D Radiate its energy D 11 eV Slide 41 / 43 Slide 42 / 43 40 A container is filled with a gas consisting of atoms in the ground 41 A container is filled with a gas consisting of atoms in the ground state. The energy energy level diagram for the atoms is shown on state. The energy energy level diagram for the atoms is shown on the right. The gas is irradiated with electromagnetic radiation with the right. The gas is irradiated with electro-magnetic radiation with the energy range from 4 eV to 9 eV. Which set of photon energies the energy range from 4 eV to 9 eV. Which of the following might be found in the emission spectrum transitions will produce a photon with the longest wavelength? A 1 eV, 2 eV, and 6 eV A From n = 4 to n = 1 B 2 eV, 3 eV, and 4 eV B From n = 2 to n = 1 C 1 eV, 3 eV, and 5 eV C From n = 3 to n = 1 D 7 eV, 8 eV, and 9 eV D From n = 4 to n = 3
Slide 43 / 43 42 According to the Bohr’s theory of the hydrogen atom, electrons starting in the 4th energy level and eventually ending in the ground state could produce a total of how many different spectral lines? A 3 B 4 C 6 D 9
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