+2 Physics - Unit 5 - Electromagnetic Waves And Wave Optics

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+2 Physics - Unit 5 -  Electromagnetic Waves And Wave Optics

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


Questions and Answers
  • 1. 
    In an electromagnetic wave
    • A. 

      Power is transmitted in a direction perpendicular to both the fields

    • B. 

      Power is transmitted along electric field

    • C. 

      Power is transmitted along magnetic field

    • D. 

      power is equally transferred along the electric and magnetic fields

  • 2. 
    Electromagnetic waves are
    • A. 

      Transverse

    • B. 

      Longitudinal

    • C. 

      May be longitudinal or transverse

    • D. 

      Neither longitudinal nor transverse

  • 3. 
    Refractive index of glass is 1.5. Time taken for light to pass through a glass plate of thickness 10 cm is
    • A. 

      (4)

    • B. 

      (3)

    • C. 

      (2)

    • D. 

      (1)

  • 4. 
    In an electromagnetic wave the phase difference between electric field and magnetic field is
    • A. 

      Zero

    • B. 

      π/2

    • C. 

      π/4

    • D. 

      π

  • 5. 
    Atomic spectrum should be
    • A. 

      Pure line spectrum

    • B. 

      Absorption line spectrum

    • C. 

      Absorption band spectrum.

    • D. 

      Emission band spectrum

  • 6. 
    When a drop of water is introduced between the glass plate and plano convex lens in Newton’s rings system, the ring system
    • A. 

      Contracts

    • B. 

      Expands

    • C. 

      First expands, then contracts

    • D. 

      Remains same

  • 7. 
    A beam of monochromatic light enters from vacuum into a medium of refractive index μ. The ratio of the wavelengths of the incident and refracted waves is
    • A. 

      (1)

    • B. 

      (2)

    • C. 

      (3)

    • D. 

      (4)

  • 8. 
    If the wavelength of the light is reduced to one fourth, then the amount of scattering is
    • A. 

      Increased by 256 times

    • B. 

      Decreased by 256 times decreased by 256 times

    • C. 

      increased by 16 times

    • D. 

      Decreased by 16 times

  • 9. 
    In Newton’s ring experiment the radii of the m th and (m + 4) th dark rings are respectively and . What is the value of m?
    • A. 

      10

    • B. 

      8

    • C. 

      4

    • D. 

      2

  • 10. 
    The path difference between two monochromatic light waves of wavelength 4000 Å is  m. The phase difference between them is
    • A. 

      π

    • B. 

    • C. 

      3π/2

    • D. 

      π/2

  • 11. 
    In Young’s experiment, the third bright band for wavelength of light 6000 Å coincides with the fourth bright band for another source in the same arrangement. The wave length of the another source is
    • A. 

      4500 Å

    • B. 

      6000 Å

    • C. 

      5000 Å

    • D. 

      4000 Å

  • 12. 
    • A. 

      3

    • B. 

      2

    • C. 

      1

    • D. 

      4

  • 13. 
    A diffraction pattern is obtained using a beam of red light. What happens if the red light is replaced by blue light?
    • A. 

      Diffraction pattern becomes narrower and crowded together

    • B. 

      Bands disappear

    • C. 

      no change

    • D. 

      Diffraction pattern becomes broader and farther apart

  • 14. 
    The refractive index of the medium, for the polarising angle
    • A. 

      1.732

    • B. 

      1.414

    • C. 

      1.5

    • D. 

      1.468