Atypical adult ear has a surface area of 1.92 × 10-3 m2. the sound intensity during a normal conversation is about 2.13 × 10-6 w/m2 at the listener's ear. assume that the sound strikes the surface of the ear perpendicularly. how much power is intercepted by the ear?

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?