Star A is identical to Star B, except that Star A is twice as far from us as Star B. Therefore,
A. both stars have the same luminosity, but the apparent brightness of Star B is twice that of Star A.
B. both stars have the same apparent brightness, but the luminosity of Star B is four times that of Star A.
C. both stars have the same luminosity, but the apparent brightness of Star A is four times that of Star B.
D. both stars have the same luminosity, but the apparent brightness of Star B is four times that of Star A.
Answer:D
Star A is identical to Star B, except that Star A is twice as far from us as Star B. Therefore,
A. both stars have the same luminosity, but the apparent brightness of Star B is twice that of Star A. B. both stars have the same apparent brightness, but the luminosity of Star B is four times that of Star A. C. both stars have the same luminosity, but the apparent brightness of Star A is four times that of Star B. D. both stars have the same luminosity, but the apparent brightness of Star B is four times that of Star A.