In the given circuit, V1 and V2 are
11.3 V & 0.3 V
0.3 V & 11.3 V
11.3 V & 11.3 V
0.3 V & 0.3 V
Potential barrier for Si, VB=0.7V and Ge, VB=0.3V
Hence, V1 = 12 - 0.7 = 11.3 V and V2 = 0 + 0.3 = 0.3 V