Slide 1 / 68 The “Cathode Rays” experiment is associated 1 with: A Millikan B Thomson C Townsend D Plank E Compton
Slide 2 / 68 2 The electron charge was measured the first time in: A Cathode ray experiment B Photoelectric effect experiment C Oil drop experiment D Diffraction electrons from aluminum foil E Compton effect experiment
Slide 3 / 68 3 Which of the following colors associated with the lowest temperature? A Violet B Blue C Green D Yellow E Red
Slide 4 / 68 4 Which of the following photons has the greatest energy? A Infrared B Blue C X-Ray D γ- photon E UV – photon
Slide 5 / 68 5 The energy of a photon depends on: A Amplitude B Speed C Temperature D Pressure E Frequency
Slide 6 / 68 6 How does the energy of a photon change if the wavelength is doubled? A Doubles B Quadruples C Stays the same D Is cut to one-half E Is cut to one-fourth
Slide 7 / 68 7 How does the momentum of a photon change if the wavelength is halved? A Doubles B Quadruples C Stays the same D Is cut to one-half E Is cut to one-fourth
Slide 8 / 68 8 The photoelectric effect explains : A The wave nature of light B The particle nature of light C The wave properties of an electron D The particle properties of an electron E The atomic structure
Slide 9 / 68 9 The kinetic energy of photo-electrons depends on: A Speed of light B Angle of illumination C Intensity of light D Wavelength E None of the above
Slide 10 / 68 10 Which of the following is the formula of the photon mass? A m = h/cλ B m = cλ/h C m = h/f D m = f/h m = Ec 2 E
Slide 11 / 68 11 The maximum kinetic energy of photo-electrons depends on which of the following: I. The light intensity II. The frequency of the light III. The nature of the photo-cell A Only I B Only II C Only III D Only I and II E Only II and III
Slide 12 / 68 12 Which of the following formulas explains the photo-electric effect? A hλ = W 0 + KE B hf = W 0 - KE C hf = W 0 + KE D hλ = -W 0 + KE E hc/λ = W 0 - KE
Slide 13 / 68 13 Which of the following graphs is a correct relationship between the maximum kinetic energy of photo-electrons and the frequency of the incident light? A C E B D
Slide 14 / 68 14 Which of the following graphs is a correct relationship between the maximum kinetic energy of photo-electrons and the intensity of the incident light? B E A I I I C D I I
Slide 15 / 68 15 Which of the following graphs is a correct relationship between the de Broglie wavelength and the linear momentum of a particle? B E A D C
Slide 16 / 68 16 All of the following are properties of γ rays EXCEPT: They discharge electrified objects A B They ionize gases They are deflected by magnetic fields C They penetrate light objects D They are diffracted by crystals E
Slide 17 / 68 17 Which of the following phenomena provides the best evidence that light can have particle properties? A Diffraction of light B Electromagnetic radiation C Compton effect D Electron diffraction E γ-ray diffraction
Slide 18 / 68 Which of the following phenomena provides the 18 best evidence that particles can have wave properties? The absorption of photons by electrons in A an atom The alpha-decay of radioactive nuclei B The interference pattern produced by C neutrons incident on a crystal The production of x-rays by electrons D striking a metal target The scattering of photons by electrons at E rest
Slide 19 / 68 19 Which of the following formulas can be used to determine the de Broglie wavelength? A λ = hmv B λ = h/mv C λ = mv/h D λ = hm/c E λ = mc/h
Slide 20 / 68 20 A photon can disappear producing an electron and positron, this phenomenon is called? A Interference of light B Diffraction of X-Rays C Pair production D Scattering of electrons E Annihilation
Slide 21 / 68 21 When a positron collides with an electron they disappear producing photons, this phenomenon is called? A Interference of light B Diffraction of X-Rays C Pair production D Scattering of electrons E Annihilation
Slide 22 / 68 22 The following statement: “In order to understand a given experiment, we must use either the wave or the photon theory, but not both” is called? A Wave theory of light B Particle theory of light C Planetary theory of an atom D Principle of complementarity E Wave theory of matter
Slide 23 / 68 23 Electrons are accelerated to a maximum speed of v in an X-Ray tube by an applied voltage V 0 . What is the maximum speed of the electrons if the voltage is quadrupled? A 4v D B 2v E v/4 C
Slide 24 / 68 24 In a Compton Effect experiment a photon scattered from an electron at rest increases its wavelength from λ i to λ f . Which of the following deflecting angles ϴ gives the greatest raise in the wavelength of the scattered? A 0 ̊ B 30 ̊ C 60 ̊ D 90 ̊ E 180 ̊
Slide 25 / 68 25 Which one of the following objects moving at the same speed is associated with a greatest wavelength? A Neutron B Electron C Tennis ball D Bowling ball E α- Particle
Slide 26 / 68 26 According to the Bohr model of the atom, the angular momentum of an electron is: A Linearly increases with increasing electron’s velocity B Linearly increases with increasing orbital radius C Quantized D Inversely proportional to the electron’s velocity E Inversely proportional to the orbital radius
Slide 27 / 68 27 Rutherford’s experiment “Scattering α–particles by a gold foil” was conducted to prove which of the following: A Plum-pudding model of the atom B Planetary model of the atom C De Broglie hypothesis D Wave nature of light E Quantum theory of light
Slide 28 / 68 28 In Rutherford’s Experiment “Scattering α – particles by a gold foil” the biggest part of α – particles could pass through the foil undeflected. Which of the following properties of the atom can be explained from this observation? A The positive charge is concentrated in the nucleus B The nucleus has electrons and protons C The atomic mass is concentrated in the nucleus D The α – particles couldn’t be deflected by electrons E The size of the nucleus is much less than the size of the atom
Slide 29 / 68 29 Which of the following statement(s) can be associated with Bohr’s theory of the atom? I. An electron orbiting the nucleus can change its energy continuously II. An electron orbiting the nucleus emits energy and falls on the nucleus III. An electron orbits the nucleus without radiating energy and can change its energy only by a certain portion when it jumps between the orbits IV. The angular momentum of an electron around the nucleus is equal an integer times h/2π A I and II C II and III E I, II, III and IV D III and IV B II and IV
Slide 30 / 68 30 When an electron falls from an orbit where n = 2 to n = 1: A A photon is emitted B A photon is absorbed C No change in atomic energy D Atomic energy decreases to zero E Atomic energy increases
Slide 31 / 68 31 When an electron jumps from an orbit where n = 1 to n = 3 its orbital radius in terms of the smallest radius r 1 is: A r 1 /9 B r 1 /3 C 2 r 1 D 3 r 1 E 9 r 1
Slide 32 / 68 32 When an electron jumps from an orbit where n = 1 to n = 4 its energy in terms of the energy on the ground level is: A E 1 /9 B E 1 /16 C 2 E 1 D 4 E 1 E 16 E 1
Slide 33 / 68 33 An electron is moving around a single proton in an orbit characterized by n = 5. How many of the electron's de Broglie wavelengths fit into the circumference of this orbit? A 3 B 4 C 5 D 16 E 25
Slide 34 / 68 34 In a cathode ray tube an electron is accelerated by an electric field. When the applied voltage is 600 V the electron’s De Broglie wavelength is λ. What is the De Broglie wavelength of the accelerated electron through a potential difference of 150 V? A λ B 2 λ C λ /2 D λ /4 E 4 λ
Slide 35 / 68 35 According to Maxwell’s theory of electro- magnetism an electron orbiting the atomic nucleus: A Changes its energy by certain portions B Conserves its angular momentum C Conserves its energy D Radiates its energy and falls on the nucleus E Changes its angular momentum by certain portions
Slide 36 / 68 36 A hypothetical atom has the energy levels presented by the graph. An electron is excited from the ground state to the energy level -1 eV. The following are the energies of the emitted photons EXCEPT: A 9 eV B 4 eV C 6 eV D 2 eV E 10 eV
Slide 37 / 68 37 A hypothetical atom has energy levels presents by the graph. A container with the hypothetical gas is irradiated with electro-magnetic radiation with the energy range from 4 eV to 9 eV. The following sequence of the photons can be found in the emission spectrum. A 1 eV, 2 eV, and 6 eV only B 2 eV, 3 eV, and 4 eV only C 1 eV, 3 eV, and 5 eV only D 7 eV and 2 eV only E None from the above
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