If an infant can scream at a sound level of 114-dβ measured at a distance 12-cm from their mouth,1). how far away should a parent stand so that the child can be seen but not heard? (The threshold of hearing is 0-dβ, or equivalentlyI0= 10-12-Wm-2.) Assume spherical symmetry for the dispersion of the sound wave energy (this is of course a bad assumption).2).How much power is the child putting in to screaming?
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