+2 Physics Unit 7 - Dual Nature Of Radiation And Matter And Relativity

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+2 Physics Unit 7 - Dual Nature Of Radiation And Matter And Relativity

Prepared by P. ILAIYARAJA M. Sc. ,B. Ed. , PG ASST IN PHYSICS , GHSS, PANCHANATHIKKULAM EAST, NAGAI DT.   ; & www. Padasalai. Net


Questions and Answers
  • 1. 
    A photon of frequency ν is incident on a metal surface of threshold frequency νο. The kinetic energy of the emitted photoelectron is
    • A. 

      (1)

    • B. 

      (2)

    • C. 

      (3)

    • D. 

      (4)

  • 2. 
    The work function of a photoelectric material is 3.3 eV. The threshold frequency will be equal to
    • A. 

      (1)

    • B. 

      (2)

    • C. 

      (3)

    • D. 

      (4)

  • 3. 
    The stopping potential of a metal surface is independent of
    • A. 

      Intensity of incident radiation

    • B. 

      Frequency of incident radiation

    • C. 

      The nature of the metal surface

    • D. 

      Velocity of the electrons emitted.

  • 4. 
    At the threshold frequency, the velocity of the electrons is
    • A. 

      Zero

    • B. 

      Maximum

    • C. 

      Minimum

    • D. 

      Infinite

  • 5. 
    The photoelectric effect can be explained on the basis of
    • A. 

      Quantum theory of light

    • B. 

      Corpuscular theory of light

    • C. 

      Wave theory of light

    • D. 

      Electromagnetic theory of light

  • 6. 
    • A. 

      Charge

    • B. 

      Momentum

    • C. 

      Velocity

    • D. 

      Mass

  • 7. 
    If the kinetic energy of the moving particle is E, then the de Broglie wavelength is,
    • A. 

      (1)

    • B. 

      (2)

    • C. 

      (3)

    • D. 

      (4)

  • 8. 
    The momentum of the electron having wavelength 2Å is
    • A. 

      (3)

    • B. 

      (4)

    • C. 

      (2)

    • D. 

      (1)

  • 9. 
    According to relativity, the length of a rod in motion
    • A. 

      Is less than its rest length

    • B. 

      is more than its rest length

    • C. 

      May be more or less than or equal to rest length depending on the speed of the rod

    • D. 

      is same as its rest length

  • 10. 
    If 1 kg of a substance is fully converted into energy, then the energy produced is
    • A. 

      (1)

    • B. 

      (2)

    • C. 

      (3)

    • D. 

      (4)