Dual Nature Of Radiation & Matter

15 Questions | Total Attempts: 462

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Dual Nature Of Radiation & Matter

Time: 30 Minute


Questions and Answers
  • 1. 
    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):
    • A. 

      105 h

    • B. 

      106 h

    • C. 

      10-3 h

    • D. 

      103 h

  • 2. 
    Photoelectric effect can be caused by:
    • A. 

      X-rays

    • B. 

      Visible light

    • C. 

      γ-rays

    • D. 

      All of these

  • 3. 
    A graph plotted taking stopping potential along the y-axis and frequency of incident light (v) along the x-axis. The slope of this graph is given by:
    • A. 

      H

    • B. 

      E

    • C. 

      Eh

    • D. 

      H/e

  • 4. 
    Protons and alpha particles have the same de-Broglie wavelength. What is same for both of them?
    • A. 

      Energy

    • B. 

      Time Period

    • C. 

      Frequency

    • D. 

      Momentum

  • 5. 
    Maximum kinetic energy (Eo) of a photoelectron varies with frequency (f) of the incident radiation. Which of the following correctly represents this variation?
    • A. 
    • B. 
    • C. 
    • D. 
  • 6. 
    What is the de-Broglie wavelength of a proton accelerated from rest through a potential difference of V volts?
    • A. 

      12.3 Ǻ

    • B. 

      1.23 Ǻ

    • C. 

      0.123 Ǻ

    • D. 

      None of these

  • 7. 
    A proton, a neutron, an electron and an α-particle have same energy. Then their de-Broglie wavelengths compare as:
    • A. 
    • B. 
    • C. 
    • D. 
  • 8. 
    An X-ray tube produces a continuous spectrum of radiation with its short wavelength end at 0.45 Ǻ. What is the maximum energy of a photon in the radiation?
    • A. 
    • B. 
    • C. 
    • D. 

      None of these

  • 9. 
    Which of the following represents the variation of de-Broglie wavelength (λ) with momentum (p) of a body?
    • A. 
    • B. 
    • C. 
    • D. 
  • 10. 
    When an electron jumps across a potential difference of 1 V, it gains energy equal to:
    • A. 
    • B. 
    • C. 
    • D. 
  • 11. 
    Which of the following has minimum stopping potential?
    • A. 

      Blue

    • B. 

      Yellow

    • C. 

      Violet

    • D. 

      Red

  • 12. 
    If the momentum of electron is changed by P, then the de Broglie wavelength associated with it changes by 0.5%. The initial momentum of electron will be:
    • A. 

      100 P

    • B. 

      200 P

    • C. 

      400 P

    • D. 

      P/200

  • 13. 
    The kinetic energy of an electron gets tripled, then the de-Broglie wavelength associated with it changes by a factor:
    • A. 
    • B. 
    • C. 
    • D. 

      3

  • 14. 
    When the radiation of a photoelectron emitter, the stopping potential is found to be 9V. If e/m for the electron is   the maximum velocity of the ejected electron is:
    • A. 
    • B. 
    • C. 
    • D. 
  • 15. 
    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 is:
    • A. 

      1 : 4

    • B. 

      1 : 2

    • C. 

      1 : 1

    • D. 

      1 : 5

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