Is Huygen’s principle valid for longitudinal sound waves?
Hint: Huygen's principle is all about the formation of wavefronts.
Step 1: Find the shape of wavefronts in a sound wave.
When we are considering a point source of a sound wave, the disturbance due to the source propagates in spherical symmetry that is in all directions. The formation of wavefronts is in accordance with Huygen's principle.
So, Huygen's principle is valid for longitudinal sound waves also.
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