# hw_ch28 - Ch 28 HW Solutions 2(a The speakers are two...

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Ch. 28 HW Solutions 2.) (a) The speakers are two coherent sources at the same location. They emit in phase so the amplitudes are added: 2A. (b) The speakers are 90 cm apart, or half a wavelength. Along the x-axis their waves are 180 out of phase so the interference is destructive: 0A. (c) Same as part (b): 0A. (d) The speakers are now 180 cm apart along the x-axis, or one full wavelength. The inter- ference is then fully constructive so the combined amplitude is 2A. 7.) The wavelength of light is λ = 546 nm. Bright fringes occur for constructive inter- ference, Δ s = . (a) The zeroth order fringe on the screen is equidistant from the slits, so Δ s = 0 m. (b) The ﬁrst order bright fringe occurs for Δ s = λ = 546 nm. (c) The second order bright fringe occurs for Δ s = 2 λ = 1092 nm. (d) The third order bright fringe occurs for Δ s = 3 λ = 1638 nm. 9.) The wavelength of light is λ = 589 nm, the slit width is d = 0 . 100 mm, and the slit-to-screen distance is h = 1 . 50 m. Recall that for

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## This note was uploaded on 07/16/2011 for the course PHY 2005 taught by Professor Lee during the Summer '08 term at University of Florida.

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hw_ch28 - Ch 28 HW Solutions 2(a The speakers are two...

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