When you "crack" a knuckle, you suddenly widen the knuckle cavity, allowing more volume for the synovial fluid inside it and causing a gas bubble suddenly to appear in the fluid. The sudden production of the bubble, called "cavitation, "produces a sound pulse - the cracking sound. Assume that the sound is transmitted uniformly in all directions and that it fully passes from the knuckle interior to the outside. If the pulse has a sound level of 50 dB at your ear, estimate the rate at which energy is produced by the cavitation.

When you "crack" a knuckle, you suddenly widen the knuckle cavity, all

1.	When you "crack" a knuckle, you suddenly widen the knuckle cavity, allowing more volume for the synovial fluid inside it and causing a gas bubble suddenly to appear in the fluid. The sudden production of the bubble, called "cavitation, "produces a sound pulse - the cracking sound. Assume that the sound is transmitted uniformly in all directions and that it fully passes from the knuckle interior to the outside. If the pulse has a sound level of 50 dB at your ear, estimate the rate at which energy is produced by the cavitation.
Answer» SOLUTION :`1.13 XX 10^(-7) W ~~ 0.1 MU W. `

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