Question

The color of a distant star in the sky is an indication of its :
A) Size
B) Temperature
C) Distance
D)Frequency

Answer 1

Hint: The colors of the stars are different. The color depends on the hotness since the hottest star is blue.

Complete step by step answer:
We know that all stars are not the same size or color. Even they are not visible to the naked eye. If we look to the sky we can see the tiny colored spots that are sparkling. The color of the star is the indication of the nature of the surface of the star. Mainly the colors are related with the wavelength. In the visible light spectrum, the color with greater wavelength is red and the color with shorter wavelength is blue.
The hottest stars are blue in color. And the coolest stars are red in color. Now we can relate the wavelength and the temperature of the star. The wavelength and the temperature are inversely proportional. When the stars are arranged in the increasing order of hotness or temperature, the coolest star will have high wavelength and the hottest star will have shorter wavelength. When the temperature increases, the gas inside the star will expand. It will make it hotter. Thus the color will change according to hotness.
Thus the color of the star is the indication of temperature of the star.
The answer is option B.

Note: The largest star Vega is in blue color and tiny star Proxima centauri is in red color. In the day also the stars are present. But they are not visible due to the sunlight.