Question

13. Recall from our last unit that air "breaks down" and starts conducting - resulting either in a little spark, or in lightning - when the electic field in the air reaches about 3 MV/m. Let's examine the physies of a rather modest lightning bolt between the ground and a storm- clund, that is 605 m (1985 H) up in the air. (i) Given the cland height and the lightning's what is the approximate potential difference this lightning ? electric field, that produces (it) Edit T h e A typical bolt of lightning carries 45 kA of current. How much power. is delivered in such a bolt of lightning? ü) If a crack of thunder registers a very lond sound level of 112 dB at a distance of 1.20 mi, what percent of the lightning's power has been converted to sound energy intring's a distance gisters a vo

Answer 1

(0) En E: electric field di distance bw cloud & earth V- Ed v= 3 605 - 1875 M. IV = 18 15 MV P-VI p. power delivered P. 1815 x 45 x 100 x 103 w =816758109W = 81.675x105 W P=81.68 TW

) BedB) = 10 609.03 Io: 10-12 W/m? (reference intensity 112=10 109 10 12 Is 1010190.158 W/m I. Intensity converted to sound Power: 0.158x (1931.222 그' or Power: 0.589810W % of power of original lightining a p Power 700 a x 81.68 x 103 = 0.589x106 100 a-7.2810?