728/CH4/EX4.8/Ex4_8_ans.txt


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 Cut-off wavelength (in cm) =   
 
    20.  
 
 Guide wavelength (in cm) =   
 
    15.  
 
 Phase velocity (in cm/s) =   
 
    3.750D+10  
 
 Group velocity (in cm/s) =   
 
    2.400D+10