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 - Apr 5, 2010
 
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I had the longest time figuring out what exactly they meant by perpendicular and parallel to the direction of motion when contrasting the two.. 
the following website finally clarified!
http://www.acs.psu.edu/drussell/Demos/waves/wavemotion.html
🙂
	
		
			
		
		
	
				
			the following website finally clarified!

http://www.acs.psu.edu/drussell/Demos/waves/wavemotion.html
🙂