Question

2. Vega is measured to have an apparent visual brightness of 3650×10−26 W/m2 /Hz and lies at a distance of 7.7 pc from the Sun. (a) What flux would be observed if the star were moved to a distance of 2.0 kpc? (b) What flux would be observed if the star were moved to the Large Magellanic Cloud (LMC) which has a distance of approximately 52 kpc? (c) The apparent visual magnitude (V) of Vega is 0.03. What V magnitude would Vega have in the LMC?

Answer 1