Physical Constants Astro Constants Particle Data Unit Conversion Periodic Tables Materials Safety Nobel Info Exact Time Fund. This is important because a long wavelength means that the sound wave can pass around barriers, like rocks, easily. This property of a wave is called diffraction.
Diffraction describes the ability of a wave to pass around a barrier.
The longer the wave's length the easier it is for the wave to do this. To get an idea of how this happens imagine that you and ten of your friends hold hands and walk through a park. When you come to a tree you must let go of a hand to get around the tree. Now, imagine again that you are doing this with only three friends. When you get to a tree with only three of you, one of you could be left at the tree and it would be much more difficult for the remaining two of you to reattach.