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The equation for spherical progressive wave is (where $r$ is the distance from the source) 
  • A$y = a\sin (\omega t - kx)$
  • B$y = \frac{a}{{\sqrt r }}\sin (\omega t - kx)$
  • C$y = \frac{a}{2}\sin (\omega t - kx)$
  • D$y = \frac{a}{r}\sin (\omega t - kx)$
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