Atrain blows its whistle as it enters a 50 m long tunnel. what is the time delay heard by a person at the other end of the tunnel between the sound of the train's whistle through the rails and through the air? assume that the speed of sound in the air and steel are 342 m/s and 5960 m/s respectively. i probably know how to answer this but i just don't understand what the question is saying and what i'm supposed to do.

Aspecified volume of space contains an electric field for which the magnitude is given by e=e0cos(ωt). suppose that e0 = 20 v/m and ω = 1.0 × 107 s−1. part a what is the maximum displacement current through a 0.80 m2 cross-sectional area of this volume? express your answer with the appropriate units. idisp, max i d i s p , m a x = nothing nothing request answer part b how would this area have to be oriented relative to the electric field to get this maximum displacement current?