mt2soln_07

mt2soln_07 - Physics 9B-C Midterm 2 Solutions Cole[1 a...

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Unformatted text preview: Physics 9B-C Midterm 2 Solutions Cole [1] a) 2π/3 b) false c) false d) all of the above e) pressures f) normal g) none of the above h) decrease i) increase by the same amount j) ¬. [2] a) ( 5 pts) The 10th interference max ƒ = 10(2π) is missing because ∫ = 2π: ! " # # \$ \$ \$ % \$ % ! ! " # \$ " # ! 2 2 10 2 10 d a sin sin õ d a ! 10 . b) ( 5 pts) There are 9 fringes to the right of the central max, 9 to the left and one in the center õ N = 2(9) + 1 = 19. c) (10 pts) I I " ! & ’ ( ) & ’ * ( ) + cos sin 2 2 2 2 2 ! " " . At the 5th interference max ƒ = 5(2π) so the cos 2 ƒ/2 = 1. From part (a) " ! \$ \$ ! ! " # ! 10 5 10 2 õ I I " ! & ’ * ( ) + ! & ’ * ( ) + ! & ’ ( ) ! sin sin . . " " \$ \$ 2 2 2 2 2 2 2 1 1 57 0 41 [3] a) (4 pts) At the central max, ƒ = 0 õ A net = 4A. b) (8 pts) c) (4 pts) At ! \$ ! 3 , A net = 2A cos 30° = 3 A d) (4 pts) The intensity is I á A 2 net = 3 A 2 , but at the central max, Iø á (4 A ) 2 = 16 A 2 ; hence...
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