Halliday 2 Cap 18 - P18 086

Transcript

86. When φ = 0 it is clear that the superposition wave has amplitude 2∆pm . For the other cases, it is useful to write

 φ φ ∆p1 + ∆p2 = ∆pm (sin(ωt) + sin(ωt − φ)) = 2∆pm cos sin ωt − . 2 2 The factor in front of the sine function gives the amplitude for all cases considered: φ =  √ √ √ ∆pm 2, ∆pm 3, ∆pm 2 + 2, respectively. π π π 2, 3, 4 gives