As a wave propagates
  • A
    The wave intensity remains constant for a plane wave
  • B
    The wave intensity decreases as the inverse of the distance from the source for a spherical wave
  • C
    The wave intensity decreases as the inverse of square of the distance from the source for a spherical wave
  • D
    Total intensity of the spherical wave over the spherical surface centred at the source remains constant at all time
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