FIND : 



(a) The height of the reflected wave, 



(b) the height of the transmitted wave, and 



(c) the height of the reflected wave for a linear slope of the 

 same length. 



SOLUTION: 



(a) L : = CjT = Sg&[ T = /9. 8(2,500) (20 x 60) 



L, = 187,800 meters (116.7 miles) 



I 24,000 _ 19 . 



I7- 187,800 ' °- 128 



El / 2 » 5o ° 



yJT ~ V 100 



500 



5 



From Figure 22 

 H 



rr =0 - 46 



1 



H = 0.46 H. = 0.46(0.6) = 0.28 meter (0.91 foot) 

 (b) From conservation of energy, 



y H J L i 10, 055(0. 6) 2 187,800 n ' nn7 . , 



E = l_i. = ' : i = 8.50 x 10' joules 



i 8 8 



y H v> L i 10,055(0.28) 2 187,800 i nr - . , 



E = — - = — = 1.85 x 10 7 joules 



^8 8 J 



E = E. - E = 6.65 x 10 7 joules 

 t % ■ r 



L t = L 2 = C 2 T = i/gdj T = /9. 8(100) (20 x 60) 



L, = 37,600 meters (23.3 miles) 



78 



