- #1
Aleisha
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Homework Statement
Speech at a distance of 45.1 cm has a sound level of 59.3 dB. Assuming that the energy in the sound spreads out equally in all directions from the person's mouth, calculate the total power output from the person.
Given:
Distance= 0.451m
Sound level 59.3 dB
P=? J
Homework Equations
I=P/A
A=4 x Pi x r^2
The Attempt at a Solution
A= 4 x Pi x 0.451^2
= 2.5560 m^2
I tried to find I (Intensity) by rearranging the; dB=10 log (I/Io) but isn't possible... So I'm a little stuck as to how to calculate the Intensity so I can substitute into the I=P/A equation. I know somehow I must use the given decibels at some point but I've been looking for an equation but can't find it.
Much appreciate if someone could help, thank you :)