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Old Feb 8th 2009, 08:45 PM   #1
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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.
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