CBSE  /  Class 12  /  Physics  /  Dual Nature of Radiation and Matter

  • 1. 
    Millikan's oil drop experiment makes use of:

  • Stokes' law
  • Boyle's law
  • Gas equation
  • Bernoulli's theorem

  • 2. 
    X-rays are:

  • deflected by an electric field
  • deflected by a magnetic field
  • deflected by both electric and magnetic fields
  • not deflected by electric and magnetic fields

  • 3. 
    In photo electric emission, for alkali metals the threshold frequency lies in the:

  • visible region
  • ultraviolet region
  • infrared region
  • far end of the infrared region

  • 4. 
    Which of the following radiations cannot eject photo electrons?

  • ultraviolet
  • infrared
  • visible
  • X-rays

  • 5. 
    What is the de-Broglie wavelength of an electron accelerated from rest through a potential difference of V volts?

  • \(\frac{12.3}{V^2}\) Å
  • \(\frac{12.3}{V}\) Å
  • \(\frac{12.2}{V^2}\) Å
  • None of these

  • 6. 
    What is the de-Broglie wavelength of an electron accelerated from rest through a potential difference of 100 volts?

  • 12.3 Å
  • 1.23 Å
  • 0.123 Å
  • None of these

  • 7. 
    What is the de-Broglie wavelength of a proton accelerated from rest through a potential difference of V volts?

  • \(\frac{12.3}{√V}\) Å
  • \(\frac{12.3}{V}\) Å
  • \(\frac{12.2}{V^2}\) Å
  • None of these

  • 8. 
    When a yellow light is incident on a surface, no electrons are emitted while green light can emit electrons. If the red light is incident on the surface then:

  • no electrons are emitted
  • photons are emitted
  • electrons of higher energy are emitted
  • electrons of lower energy are emitted

  • 9. 
    The de-Broglie wavelength of particle of mass 1 mg moving with a velocity of 1 ms-1, in terms of Planck's constant h, is given by (in metre):

  • 105 h
  • 106 h
  • 10-3 h
  • 103 h

  • 10. 
    Evidence of the wave nature of light cannot be obtained from:

  • diffraction
  • interference
  • doppler effect
  • reflection
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