Apparent magnitutu is thebrightness measured by an observerwith
a specificdistance. According to inverse square law of brightness
smaller the distance , greater the brightness.
a. Apparent magnitude of A
          Â
m - M = 5 log (d/10)
          Â
m - 4.4 = 5 log ( 1,35/10)
          Â
m - 4.4 = - 4.34
          Â
m = 0.06
Apparent Magnitude of B
         m - M =
5log(d/10)
         m - 5.7 =
5 log (1,35/10)
         m - 5.7 =
-4.34
         m =
1.36
         Â
Where M is the absolute magnitute and m is the apparent
magnitude.
    Alpha centauri A have more brightness
compared to B. Since A have the low apparent magnitude.
