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

  • 1. 
    De-Broglie equation states the:

  • dual nature
  • particle nature
  • wave nature
  • none of these

  • 2. 
    Protons and alpha particles have the same de-Broglie wavelength. What is same for both of them?

  • Energy
  • Time period
  • Frequency
  • Momentum

  • 3. 
    Kinetic energy of emitted electrons depends upon :

  • frequency
  • intensity
  • nature of atmosphere surrounding the electrons
  • none of these

  • 4. 
    De-Broglie wavelength of a body of mass m and kinetic energy E is given by (symbols have their usual meanings):

  • \(\frac{h}{\sqrt{2mE}}\)
  • \(\frac{h}{2mE}\)
  • \(\frac{\sqrt{2mE}}{h}\)
  • \(\frac{h}{mE}\)

  • 5. 
    The ratio of specific charge of an alpha particle to the proton is:

  • 1 : 2
  • 2 : 1
  • 4 : 1
  • 1 : 4

  • 6. 
    In Thomson's experiment number of parabola gives :

  • the no. of electrons present in element
  • the no. of proton present in element
  • the no. of neutrons present in element
  • the no. of isotopes of the element present

  • 7. 
    The work function of photoelectric material is 3.3 eV. The threshold frequency will be equal to:

  • 8 × 1014 Hz
  • 8 × 1010 Hz
  • 5 × 1010 Hz
  • 4 × 1014 Hz

  • 8. 
    The strength of photoelectric current depends upon :

  • angle of incident radiation
  • frequency of incident radiation
  • intensity of incident radiation
  • distance between anode and cathode

  • 9. 
    The momentum of an electron that emits a wavelength of 2 Å. will be:

  • 6.4 × 10-36 kgms-1
  • 3.3 × 10-24 kgms-1
  • 3.3 × 10-34 kgms-1
  • none of these

  • 10. 
    Name the scientists who first studied the passage of electricity through fluids to establish the electrical nature of matter:

  • Millikan
  • Planck
  • Faraday
  • Boyle
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