Okay, I found a site with a table of Greek letters (including Lambda):
http://www.mathacademy.com/pr/prime/articles/greek/index.asp
Type: Posts; User: Zach L.
Okay, I found a site with a table of Greek letters (including Lambda):
http://www.mathacademy.com/pr/prime/articles/greek/index.asp
That would also be the speed of other waves besides light. :)
I think it is lambda. My physics book seems to agree too. ;)