# HW4Sol - Solutions to WebAssign HW#4 Giancoli Ch 34-3 8 15...

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Solutions to WebAssign HW #4 - Giancoli Ch. 34-3, 8, 15, 16, 20, 29, 35, 36, 42; (due 2/18) 3. For constructive interference, the path difference is a multiple of the wavelength, as given by Eq. 34-2a. Apply this to the third order. ( ) 9 6 3610 10 m sin 3.9 10 m sin sin28 m dmd λ θλ θ × =→ == = × ° 8. For constructive interference, the path difference is a multiple of the wavelength, as given by Eq. 34-2a. The location on the screen is given by tan , x = l as seen in Fig. 34-7(c). For small angles, we have sin tan . x ≈≈ l ( )( )( ) 9 4 3 680 10 m 3 2.6m sin 1.4 10 m 38 10 m xm md x × =→=→ = × × l l 15. The presence of the water changes the wavelength according to Eq. 34-1, and so we must change to . n n = For constructive interference, the path difference is a multiple of the wavelength, as given by Eq. 34-2a. The location on the screen is given by tan , x = l as seen in Fig. 34-7(c). For small angles, we have sin tan . x l Adjacent fringes will have 1. m ∆= ( ) () 1 12 9 3 21 5 1 sin ; ; 470 10 m 0.500m 1 2.94 10 m 1.33 6.00 10 m n nn n m m dm d m x x x dd d m m xx x d n d λλ + = = = × + ∆= − = = = = = × × l ll l l l 16.

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HW4Sol - Solutions to WebAssign HW#4 Giancoli Ch 34-3 8 15...

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