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Chapter 17 - 17.29

29. The phasor diagram is shown below: y 1 m and y 2 m represent the original waves and y m represents the

resultant wave. The phasors corresponding to the two constituent waves make an angle of 90 ◦ with

each other, so the triangle is a right triangle. The Pythagorean theorem gives y 2 m = y 1 m + y 2 m =

(3 . 0cm) 2 +(4 . 0cm) 2 =25cm 2 .Thus y m =5 . 0cm.

. .

y 2 m

y m

•

y 1 m