Physics Help Forum I need help over these 3 questions

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 Feb 8th 2009, 08:45 PM #1 Junior Member   Join Date: Oct 2008 Posts: 6 I need help over these 3 questions 1. Express (3+i4) in polar coordinates, ie. find r and Ө for which (3+i4) = re^( iӨ ) 2. Find the sum of the following superposition of waves using complex numbers: 3sin(kx-wt+2)+2sin(kx-wt-1) . 3. A wave with wave vector of magnitude k are in phase at slits 1 and 2. What is the phase difference between the partial waves arriving at P from slits 1 and 2 for light from a helium-neon laser ( 入=633 nm) when r1=65mm and r2=66mm. Attached Thumbnails

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