For sustained interference we need two sources which emit waves:
  • with same amplitude
  • with same intensity
  • in a narrow beam
  • having constant phase difference
When the interference occurs with coherent sources, _______ of the superimposing waves add like _______.
  • intensities, scalars
  • amplitudes, vectors
  • amplitudes, scalars
  • intensities, vectors
Two sources of light are said to be coherent when both give out light waves of same:
  • phase and speed
  • wave length and constant phase difference
  • intensity and wavelength
  • amplitude and phase
Phase difference between two coherent sources should be:
  • zero
  • πn rad
  • π rad
  • π/2 rad
Coherent sources can be created by the division of:
  • only amplitude
  • only wave front
  • only wavelength
  • both amplitude and wave front
In a Fresnel's biprism experiment, the two coherent sources are obtained by:
  • two slits
  • reflection
  • Refraction
  • Internal reflection
A 60.0 kHz transmitter sends an EM wave to a receiver 21 km away. The signal also travels to the receiver by another path where it reflects from a helicopter. Assume that there is a 180o phase shift when the wave is reflected. This situation will give ________.
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  • constructive interference
  • destructive inference
  • something in between constructive and destructive interference
  • None of the above
Light of wavelength λ in vacuum enters a medium of refractive index μ. Two points in this medium, lying along the path of this light, are at a distance x apart. The phase difference between these points is
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  • A
  • B
  • C
  • D
Which of the following is not essential for two sources of light in Young's double slit experiment to produce a sustained interference?
  • equal frequency
  • Constant phase difference
  • equal intensity
  • equal wavelength
Which of the following is not an example of coherent source produced by the division of wavefront?
  • Fresnel's biprism
  • Lloyd's mirror
  • Young's double slit experiment
  • Interference by thin films
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