1049_Physics ProblemsTechnical Physics

1049_Physics ProblemsTechnical Physics - 390 Interference...

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390 Interference of Light Waves (c) Ei i j i j R E = + °+ ° + °+ ° 0 120 120 240 240 ±± cos ± sin ± cos ± sin ej e j j R P E E =+ = = 0 00 0 0 E 1 E 2 E 3 y x FIG. P37.22(c) (d) i j i j R E + F H G I K J ++ L N M O Q P 0 3 2 3 2 33 cos ± sin ± cos ± sin ππ j R P EE E t =−= ° = F H G I K J 00 0 0 01 0 0 3 2 3 2 ± . ± sin at 270 at rad π ω E 1 E 2 E 3 y x FIG. P37.22(d) P37.23 j R =+= + F H G I K J 600 800 22 1 . ± . ± .. t a n . . a f a f at E R P Et = 10 0 53 1 10 0 0 927 10 0 100 0 927 . . .s i n . at at rad bg 6.00 8.00 y x E R 2 α FIG. P37.23 P37.24 If t 10 1 = sin and t 20 2 sin ωφ , then by phasor addition, the amplitude of E is E E E E E E 1 0 2 2 02 2 01 2 01 02 02 2 2 + = + + cos sin cos φφ φ b g and the phase angle is found from sin sin θ = E E 02 0 . E 01 E 02 E 0 x y FIG. P37.24 P37.25 E i i j R ° + ° 12 0 18 0 60 0 18 0 60 0 . ± .c o s . ± i n . ± j R R ° ° 21 0 15 6 26 2 26 2 36 6 . ± . ± . i n . at 36.6 12.0 18.0 ER x y 60.0 ° FIG. P37.25 P37.26 Constructive interference occurs where
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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