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what is the sound accelaration via glass
- Winner (age 9)
Mulia Bhakti, Makassar, Indonesia
I'm not sure exactly what effect you are referring to, but I'll guess
that it is that sound travels faster in most glass than in air. The
speed of sound is different in different materials. The stiffer a
material is, the faster sound travels in it. The denser it is, the
slower sound travels in it. Typical glass material is much denser than
air, but also much stiffer, since air is easily compressed. For air the
sound speed is about 330 m/s under ordinary conditions. Most typical
glass materials end up with sound speeds of 2000 m/s to 6000 m/s,
depending both on the type of glass and the type of sound. There's
nothing special about glass here- most typical solids have similar
Incidentally, in solids there are two types of sound
(longitudinal and transverse) which travel at different speeds.
Longitudinal waves consist of layers of more or less compressed
material, alternating along the direction the wave travels. That's the
only type of sound in a gas. Transverse sound (generally faster)
consists of back-and-forth displacements at right angles to the
direction the sound wave travels- just like a wave on a violin string.
(published on 10/22/2007)
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