Two stars – A and B, with luminosities 0.5 and 4.5 times the luminosity of the
Sun, respectively – are observed to have the same apparent brightness. Which star
is the more distant, and by how much?
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Stellar flux is the stellar luminosity divided by the surface area of the imaginary sphere it is situated in.
Since both of them are of same apparent brightness,
`1 = (0.5/4.5)xx(d_B^2/d_A^2)`
So, `(d_B/d_A)^2 = 9`
B must be three times farther away than A.
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