Does an expanding spherical wave continue to expand outward from its source?

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Offline edor

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Tejas Rode  asked the Naked Scientists:
   
Hi Chris!

According to Huygens' Principle, for a spherical wave, every point on its
wavefront emits wavelets, and these wavelets envelope a new wavefront in the direction of propagation of the wave.

However, the wavelets also define a wavefront in the direction of the source of the spherical wave.

Apparently Huygens' Principle does not correctly describe the directionality of the wave propagation in time.

Does an expanding spherical wave continue to expand outward from its
source, rather than re-converging inward back toward the source? If yes, what is the reason?

I am Tejas Rode from University of Bristol. Please answer my question in today's show.

Cheers!
Tejas

What do you think?
« Last Edit: 23/06/2010 16:30:03 by _system »