The phase difference between two waves represented by \[{{y}_{1}}={{10}^{-6}}\sin [100\,t+(x/50)+0.5]m\] \[{{y}_{2}}={{10}^{-6}}\cos \,[100\,t+(x/50)]m\] where x is expressed in metres and t is expressed in seconds, is approximately [CBSE PMT 2004]

• A.            1.5 rad                                    
• B.            1.07 rad
• C.            2.07 rad                                  
• D.            0.5 rad