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Dual Nature of Radiation and Matter

81 questions · Physics · NEET
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Dual Nature of Radiation and Matter

81 questions · Physics · NEET

  1. De-Broglie wavelength of an electron orbiting in the n=2 state of hydrogen atom is close to (Given Bohr radius =0.052 nm )2025 · Q155 · MCQ
  2. Which of the following options represent the variation of photoelectric current with property of light shown on the x-axis? Includes diagram2025 · Q157 · MCQ
  3. A photon and an electron (mass m ) have the same energy E. The ratio ( λphoton ​/λelectron ​ ) of their de Broglie wavelengths is: ( c is the speed of light)2025 · Q170 · MCQ
  4. The graph which shows the variation of (λ21​) and its kinetic energy, E is (where λ is de Broglie wavelength of a free particle):2024 · Q160 · MCQ
  5. If c is the velocity of light in free space, the correct statements about photon among the following are: A. The energy of a photon is E=hv. B. The velocity of a photon is c. C. The momentum of a photon, p=chv​. D. In a…2024 · Q168 · MCQ
  6. An electron and an alpha particle are accelerated by the same potential difference. Let λe​ and λα​ denote the de-Broglie wavelengths of the electron and the alpha particle, respectively, then:2024 · Q157 · MCQ
  7. If ϕ is the work function of photosensitive material in eV and light of wavelength of numerical value λ=ehc​ metre, is incident on it with energy above its threshold value at an instant then the maximum…2024 · Q181 · MCQ
  8. The de Broglie wavelength associated with an electron, accelerated by a potential difference of 81 V is given by:2023 · Q154 · MCQ
  9. The maximum kinetic energy of the emitted photoelectrons in photoelectric effect is independent of:2023 · Q156 · MCQ
  10. The work functions of Caesium (Cs), potassium (K) and Sodium (Na) are 2.14 eV,2.30 eV and 2.75 eV respectively. If incident electromagnetic radiation has an incident energy of 2.20 eV…2023 · Q136 · MCQ
  11. The minimum wavelength of X-rays produced by an electron accelerated through a potential difference of V volts is proportional to :2023 · Q137 · MCQ
  12. The light rays having photons of energy 4.2 eV are falling on a metal surface having a work function of 2.2 eV. The stopping potential of the surface is2022 · Q155 · MCQ
  13. The threshold frequency of a photoelectric metal is v0. If light of frequency 4v0 is incident on this metal, then the maximum kinetic energy of emitted electrons will be :2022 · Q159 · MCQ
  14. When two monochromatic lights of frequency, v and 2v​ are incident on a photoelectric metal, their stopping potential becomes 2Vs​​ and Vs respectively. The threshold frequency for this metal is2022 · Q141 · MCQ
  15. The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600nm, when it delivers the power of 3.3 × 10−3 watt will be : (h = 6.6 × 10−34 Js)2021 · Q133 · MCQ
  16. An electromagnetic wave of wavelength 'λ' is incident on a photosensitive surface of negligible work function. If 'm' mass is of photoelectron emitted from the surface has de-Broglie wavelength λd, then :2021 · Q149 · MCQ
  17. Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?2020 · Q134 · MCQ
  18. Light with an average flux of 20 W/cm2 falls on a non-reflecting surface at normal incidence having surface area 20 cm2. The energy received by the surface during time span of 1 minute is :2020 · Q146 · MCQ
  19. An electron is accelerated from rest through a potential difference of V volt. If the de-Broglie wavelength of the electron is 1.227 × 10-2 nm, the potential difference is :2020 · Q156 · MCQ
  20. An electron is accelerated through a potential difference of 10,000 V. Its de Broglie wavelength is (nearly) : (me = 9 × 10–31 kg)2019 · Q155 · MCQ
  21. An electron of mass m with an initial velocity v=v0​i (v0 > 0) enters an electric field E=−E0​i (E0 = constant > 0) at t = 0. If λ0 is its…2018 · Q133 · MCQ
  22. When the light of frequency 2υ0​ (where υ0​ is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is v1 . When the frequency of the incident radiation is increased to 5υ0​…2018 · Q134 · MCQ
  23. The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (kelvin) and mass m, is2017 · Q139 · MCQ
  24. The photoelectric threshold wavelength of silver is 3250 × 10−10 m. The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength 2536 × 10−10 m is {Given h = 4.14 × 10−15 eV…2017 · Q140 · Multiple correct
  25. When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2 λ, the stopping potential is 4V​. The…2016 · Q134 · MCQ
  26. An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is2016 · Q135 · MCQ
  27. Electrons of mass m with de-Broglie wavelength λ fall on the target in an X-ray tube. The cutoff wavelength (λ0) of the emitted X-ray is2016 · Q135 · MCQ
  28. Photons with energy 5 eV are incifent on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on C, no photoelectrons will reach the anode A, if the stopping…2016 · Q136 · MCQ
  29. Light of wavelength 500 nm is incifent on a metal with work function 2.28 eV. The de Broglie wavelength of the emitted electron is2015 · Q125 · MCQ
  30. A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of…2015 · Q126 · MCQ
  31. A certain metallic surface is illuminated with monochromatic light of wavelength, λ. The stopping potential for photo-electric current for this light is 3V0. If the same surface is illuminated with light of wavelength 2 $\lambda…2015 · Q129 · MCQ
  32. Which of the following figures represent the variation of particle momentum and the associated de-Broglie wavelength?2015 · Q130 · MCQ
  33. When the energy of the incident radiation is increased nby 20%, the kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 eV to 0.8 eV. The work function of the metal is2014 · Q134 · MCQ
  34. If the kinetic energy of the particle is increased to 16 times its previous value, the percentage change in the de Broglie wavelength of the particle is2014 · Q135 · MCQ
  35. A source of light is placed at a distance of 50 cm from a photo cell and the stopping potential is found to be V0. If the distance between the light source and photo cell is made 25 cm, the new stopping potential will be :2013 · Q137 · MCQ
  36. The de-broglie wavelength of neutrons in thermal equilibrium at temperature T is2013 · Q138 · MCQ
  37. A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct ?2013 · Q135 · MCQ
  38. For photoelectric emission from certain metal the cutoff frequency is υ. If radiation of frequency 2υ impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass)2013 · Q136 · MCQ
  39. The wavelength λe of an electron and λp of a photon of same energy E are related by2013 · Q137 · MCQ
  40. Two radiations of photons energies 1 eV and 2.5 eV, successively illuminate a photosensitive metallic surface of work function 0.5 eV. The ratio of the maximum speeds of the emitted electrons is2012 · Q84 · MCQ
  41. If the momentum of an electron is changed by P, then the de Broglie wavelength associated with changes by 0.5%. The initial momentum of electron will be2012 · Q85 · MCQ
  42. A 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is2012 · Q131 · MCQ
  43. Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V. The threshold frequency of the material is2012 · Q145 · MCQ
  44. An α-particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25 Wb/m2. The de Broglie wavelength associated with the particle will be2012 · Q146 · MCQ
  45. The threshold frequency for a photosensitive metal is 3.3 × 1014 Hz. If light of frequency 8.2 × 1014 Hz is incident on this metal, the cut- off voltage for the photoelectron emission is nearly2011 · Q87 · MCQ
  46. In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is2011 · Q125 · MCQ
  47. Photoelectric emission occurs only when the incident light has more than a certain minimum2011 · Q134 · MCQ
  48. Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively illuminate a metallic surface whose work function is 0.5 eV successively. Ratio of maximum speeds of emitted electrons will be2011 · Q135 · MCQ
  49. Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased to 100 kV then the de-Broglie wavelength associated with the electrons would2011 · Q136 · MCQ
  50. The electron in the hydrogen atom jumps from excited state (n = 3) to its ground state (n = 1) and the photons thus emitted irradiate a photosensitive material. If the work function of the material is 5.1 eV, the stopping potential is…2010 · Q78 · MCQ
  51. When monochromatic radiation of intensity I falls on a metal surface, the number of photoelectrons and their maximum kinetic energy are N and T respectively. If the intensity of radiation is 2I, the number of emitted electrons and…2010 · Q79 · MCQ
  52. A beam of cathode rays is subjected to crossed electric (E) and magnetic fields (B). The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by (Where V is the potential difference…2010 · Q153 · MCQ
  53. The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work functions 5.01 eV, when ultraviolet light of 200 nm falls on it, must be2010 · Q154 · MCQ
  54. A source S1 is producing, 1015 photons per second of wavelength 5000 A∘​. Another source S2 is producing 1.02 × 1015 photons per second of wavelength 5100 A∘​. Then, (power of…2010 · Q155 · MCQ
  55. The number of photo electrons emitted for light of a frequency υ (higher than the threshold frequency υ0​) is proportional to2009 · Q144 · MCQ
  56. Monochromatic light of wavelength 667 nm is produced by a helium neon laser. The power emitted is 9 mW. The number of photons arriving per sec. on the average at a target irradiated by this beam is2009 · Q145 · MCQ
  57. The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement? Includes diagram2009 · Q146 · MCQ
  58. A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 × 106 m s−1. The velocity of the particle is2008 · Q138 · MCQ
  59. The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the2008 · Q139 · MCQ
  60. In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of2008 · Q140 · MCQ
  61. Monochromatic light of frequency 6.0 × 1014 Hz is produced by a laser. The power emitted is 2 × 10−3 W. The number of photons emitted, on the average, by the source per second is2007 · Q122 · MCQ
  62. A beam of electron passes undeflected through mutually perpendicular electric and magnetic fields. If the electric field is switched off, and the same magnetic field is maintained, the electrons move2007 · Q123 · MCQ
  63. A 5 watt source emits monochromatic light of wavelength 5000 A∘​. When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0 m, the…2007 · Q124 · MCQ
  64. A photocell employs photoelectric effect to convert2006 · Q144 · MCQ
  65. When photons of energy hυ fall on an aluminimum plate (of work function E0), photoelectrons of maximum kinetic energy K are ejected. If the frequency of radiation is doubled, the maximum kinetic energy of the ejected…2006 · Q145 · MCQ
  66. In a discharge tube ionization of enclosed gas is produced due to collisions between2006 · Q146 · MCQ
  67. The momentum of a photon of energy 1 MeV in kg m/s will be2006 · Q147 · MCQ
  68. The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation the metals which will emit photoelectrons for a radiation of wavelength 4100 A∘​ is/are2005 · Q139 · MCQ
  69. A photosensitive metallic surface has work function, hυ0. If photons of energy 2hυ0​ fall on this surface, the electrons come out with a maximum velocity of 4 × 106 m/s. When the photon energy is increased to…2005 · Q140 · MCQ
  70. According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is2004 · Q132 · MCQ
  71. A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then2003 · Q143 · MCQ
  72. J.J. Thomson's cathode-ray tube experiment demonstrated that2003 · Q144 · MCQ
  73. The value of Planck's constant is2002 · Q131 · MCQ
  74. If particles are moving with same velocity, then which has maximum de Broglie wavelength?2002 · Q142 · MCQ
  75. When ultraviolet rays incident on metal plate then photoelectric effect does not occur, it occurs by incidence of2002 · Q144 · MCQ
  76. Which of the following is not the property of cathode rays ?2002 · Q145 · MCQ
  77. In Thomson mass spectrograph E⊥B then the velocity of electron beam will be2001 · Q127 · MCQ
  78. Which one among the following shows particle nature of light?2001 · Q140 · MCQ
  79. A photo-cell is illuminated by a source of light, which is placed at a distance d from the cell. If the distance become d/2, then number of electrons emitted per second, will be2001 · Q141 · MCQ
  80. By photoelectric effect, Einstein proved2000 · Q137 · MCQ
  81. Who evaluated the mass of electron infirectly with help of charge2000 · Q138 · MCQ