1271/CH14/EX14.20/20.txt


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 # PROBLEM 20 # 
Standard formula used 
  E = (h * c) * (1 / lambda1 - 1 / lambda2) 
 E = (h * c)/ lambda 

 Threshold wavelength is 5642 Angstrom.
 Incident electromagnetic wavelength is 2002.016129 Angstrom