Star A is 19 times as far away as star B. Both appear to have the same brightness. What is the ratio of the luminosity of star A to that of star B?
Star A is 19 times as far away as star B. Both appear to have the...
Star A is 5 times as far away as star B. Both appear to have the same brightness. What is the ratio of the luminosity of star A to that of star B?
Question 61 2.5 pts Star B's luminosity is 26.8 times that of star A's luminosity. Star Ais 21.5 pc away, while star Bis 3.8 pc away. So, star B appears __times the brightness of star A. Report your answer to four significant figures, please.
Which of the following statements is true? O A. Stars that are further away always appear more dim than closer stars. B. The luminosity ('intrinsic brightness") of stars decreases with distance from the observer. C. The "colour" of a star is related to its distance. 0 D. The difference between the measured ("apparent") brightness of a star and its intrinsic brightness allows you to calculate its distance. Reset Selection Which of the following statements is true? O A. Stars that...
Suppose a star has a luminosity of 9.0×1029 watts and an apparent brightness of 9.0×10−15 watt/m2 . How far away is it? Give your answer in both kilometers and light-years.
Suppose a star has a luminosity of 6.0×1026 watts and an apparent brightness of 4.5×10−12 watt/m2 . How far away is it? Give your answer in both kilometers and light-years.
2] How far away is a RR Lyrae variable star if it has a period of 0.5 days and a brightness of 2.3 x 10^-11 W/m^2? Answer: 8.14 x 10^18 m, 860 ly
7. Planet A and planet B orbit around the same star. Planet A is thre times as far away from the star as planet B is. We can write the previous statement as a ratio: TA/TB 3, where r stands for the planet's distance to the star. What is the ratio of the period of planet A around the star to the period of planet B? In other words, labeling period as T, what is TA/TB? Give your answer with...
A star is moving toward the earth far away in space. The light of the star experiences a a) sonic boom b) standing wave c) blue shift d) red shift
How far away is the star Spica, whose parallax is 0.013"?
pls help hurry pupp! If a galaxy moves away from us 4 times its original distance, how would its redshift change? It would remain the same It would increase by a factor of 1/2 It would increase by a factor of 2 It would increase by a factor of ¼ It would increase by a factor of 4 A star that is 100 light years away from us has a luminosity of 1 L_Sun. What would its luminosity be if...