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