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27 Nov 2019
When you "crack" a knuckle, you cause the knuckle cavity to widenrapidly. This, in turn, allows the synovial fluid to expand into alarger volume. If this expansion is sufficiently rapid, it causes agas bubble to form in the fluid in a process known as cavitation.This is the mechanism responsible for the cracking sound.(Cavitation can also cause pits in rapidly rotating ship'spropellers.)
If a "crack" produces a sound with an intensity level of 58 at yourear, which is 20 from the knuckle, how far from your knuckle canthe "crack" be heard? Assume the sound propagates uniformly in alldirections, with no reflections or absorption.
When you "crack" a knuckle, you cause the knuckle cavity to widenrapidly. This, in turn, allows the synovial fluid to expand into alarger volume. If this expansion is sufficiently rapid, it causes agas bubble to form in the fluid in a process known as cavitation.This is the mechanism responsible for the cracking sound.(Cavitation can also cause pits in rapidly rotating ship'spropellers.)
If a "crack" produces a sound with an intensity level of 58 at yourear, which is 20 from the knuckle, how far from your knuckle canthe "crack" be heard? Assume the sound propagates uniformly in alldirections, with no reflections or absorption.
Tod ThielLv2
27 Nov 2019
