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## Homework Statement

A baby's mouth is 30 cm from her father's ear and 150 cm from her mother's ear. Compute the difference, in dB, between the sound intensity levels heard by the father and by the mother.

## Homework Equations

Intensity = Power/ Area; power = 1/2 * mass per unit length*angular frequency^2*Area^2*v

Intensity = 1/2*Bulk modulus*Area^2*k*angular frequency

B = 10log (I/Io)

## The Attempt at a Solution

i understand how to get the velocity (344m/s), but what about the mass per unit length, angular frequency and area

I dont know how to do this problem with such little info, unless i'm using the wrong formulas

ANY help would be much appreciated