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Q. |
Which of the following is indicated by the colour of a star? |
A. | weight |
B. | distance |
C. | temperature |
D. | size |
Answer» C. temperature | |
Explanation: Colour is caused by the temperature of the surface of the star. A star approximates the behavior of a black body radiator. As a black body gets hotter its color changes. Small stars are cool (less than 3000°C) with a reddish appearance, whereas big heavy stars are hot (over 30,000°C), and have a bluish glow. |
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