Question

Four waves are described by the following equations centimeters and all the times are measured in seconds: hich all distances are measured in yA= 10 cos(Ax-4t) YB = 10 cos(5x+4t) yc = 20 cos(-10x+Bt) yo = 20 cos(-Cx-20) Note that A, B, and C are positive constants. a) Which of these waves travel in the +x direction? b) What is A if the speed of yA and ye are the same? c) What is the period of yc if yc and ye have the same speed? d) What's constant C if ya and yo have the same wavelength? e) Which wave/waves has/have the greatest speed?

Answer 1

yy = lo M(Ax-4+) J. : 20 Cos C-lox + +). tx direction. are travelling in These two | by 1 로 네드 O 봉

야부 퓨 .c Kyp 5 m A 8 y () . 볼08 M Vie - 0 -6 1 흥4 [yo hes gradest speed