+2 Physics - Unit 5 - Electromagnetic Waves And Wave Optics
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- 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.
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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.
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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.
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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.
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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.
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The path difference between two monochromatic light waves of wavelength 4000 Å is m. The phase difference between them is- A.
π
- B.
2π
- 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 light of wavelength 6000 Å is incident normally on a grating 0.005 m wide with 2500 lines. Then the maximum order is
- 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.
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The refractive index of the medium, for the polarising angle- A.
1.732
- B.
1.414
- C.
1.5
- D.
1.468
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